The Abstract (AB) field contains an English-language summary of the original document. Abstracts appear for all records, except for Conference Papers between 1982 and 1984. The abstract index contains all searchable words from the abstract.

The Article Designator (AD) field is used to specify the orientation or approach taken in the document, or an aspect of the treated topic. There are eight Article Designators (or "Treatment Codes") currently in use: Application, Economic/Cost Data/Market Survey, General Review, Historical, Literature Review/Bibliography, Management Aspects, Theoretical, and Experimental.

Enter the letter "a" to quickly browse the AD index.

The Author Email (AE) field contains the email of the author/s. This field is word indexed.

Author NameID (AI) field contains author's full name and its Open Researcher and Contributor ID (ORCID) unique identifier that may be supplied by the publisher for records added or updated beginning this May 2015.

The Accession Number (AN) field contains up to nine-digit number assigned in Ei Compendex (CDEX) to uniquely identify a particular record.

The Article Number (AR) field consists of an alphanumeric character string that is assigned to a document by the publisher. The article number will never change. It is a medium for citing/linking to/searching for articles when these do not contain the complete bibliographic information, or it is simply additional information.

The Author (AU) index can contain up to 16 author names. The author names are entered into the index in the format of last name followed by names or up to two initials as they appeared on the original article. For example, a person named James C. Smith could appear as Smith James C. Smith J. Charles, Smith JC or Smith J.

Enter the last name, or if it is a common name, enter the last name, a space, and the first initial. If you are unsure of the spelling of the last name, enter one version and you will be able to scroll through the list of names to find the other.

The Parent Book Title (BK) field contains the title of the parent book in which the record appears.

The Book Series (BS) field contains information relating to the series title of the document as it appears with the publication. The Book Series field displays in the Source (SO) field.

The Book Title (BT) field contains information relating to the original title and subtitle of the document as it appears with the publication. The Book Title field displays in the Source (SO) field.

The CAL Classification Codes (CC) field contains numerical categories which segment the literature covered in Compendex*Plus into broad subject areas.

CAL Codes are grouped into six general categories which are divided into thirty-eight subject series.  These series are further subdivided into 182 specific subject areas whose codes are applied to the articles that EI indexes.  Up to six CAL codes can be included in each record.

The CAL Codes are represented by up to six digit numbers which form a hierarchy, from broader to narrower.  For example, the CAL Code for Electrical Engineering is "70", the Code for Electricity and Magnetism (a narrower term) is "701", and the Code for Electricity: Basic Concepts and Phenomena (a yet narrower term) is 701.1.  Prior to 1993 only 3-digit CAL Codes were used; in 1993 the codes were expanded to up to six digits.

For the broadest retrieval, enter the two-digit CAL Code.  Records indexed with any CAL code beginning with those two digits will be retrieved.  To narrow retrieval, enter the three to six digit CAL Code.  Enter the longer codes without the separating digits.

CODEN is a standard code that uniquely identifies a serial publication.  CODEN are provided in all the journal article records, and in many records for conferences, reports and other serial publications.

Many publications compile material that was originally presented at conferences. The Conference Information (CF) field contains the Conference title, location, date(s), sponsor(s) and a unique conference number. Note that all papers presented at a conference are assigned the same conference number.

Individual words are posted in the Conference Information index. Standard abbreviations such as those used for institutions are used for the institutional and geographical portions of the CF field (such as "Coll" for College, "Co" for Company, "Dept" for Department, etc).

The Collaboration (CO) field contains the names of Organizations and Collaborators associated with the article.

The Conference Proceeding (CP) field contains information relating to the proceeding of the conference as it appears with the publication. The Conference Proceeding field displays in the Source (SO) field.

The Copyright (CR) field contains the copyright information associated with an article.

The Date Delivered (DD) field contains the date that the record was issued.

The DOI (DO) field contains the Digital Object Identifier - a unique and persistent digital identification code for any object of intellectual property. The DOI itself consists of two parts: a prefix which is assigned to each publisher by the administrative DOI agency, e.g., "10.1097", and a suffix which is assigned by the publisher and can be any code that the publisher chooses, e.g., "00045415-200111000-00002". The full DOI appears as such: "10.1097/00045415-200111000-00002".

You can search the DO field by entering either the prefix in quotes ("10.1097".do.) or the entire DO value in quotes ("10.1097/00004850-200609000-00008".do.).

The date (DP) field consists of the date of publication for a citation. This field is usually displayed as part of the Source (SO) field.

The Editors (ED) field contains the list of editors associated with the article.

The format for editors is last name followed by one or more initials: Smith JC or Smith J. If a single initial could not be transliterated with one letter, two or more letters may be used. Occasionally a name will include the full first name. The Editors field is phrase indexed.

Enter the last name, or if it is a common name, enter the last name and first initial.

The Electronic ISSN (EN) field contains the electronic International Standard Serial Number (eISSN) for the journal in which the article was published.

Each journal may have an ISSN, an eISSN, or both. However when there is only an eISSN available it is searchable in the ISSN index and displays in the Electronic ISSN (EN) field.

Like the ISSN, it appears as an 8-digit number, separated by a hyphen: 1029-0362.

The CDEX Unique Identifier (EU) field contains the old identifier assigned in Ei Compendex (CDEX) to uniquely identify a particular record. It has 11-character number. The first two digits represent the year, the second two digits represent the entry month, and the last seven digits represent the sequential number within the year. This data will no longer be supplied on January 1, 2018.

The Entry Week (EW) field contains a 6-digit number in the format YYYYWW representing the year and week in which an item was entered into the Compendex*Plus database. Data through April of 1993 was indexed according to entry month; beginning with entry week 22 in 1993, data has been indexed by entry week.

If you are searching data before April 1993, search for the year and entry month using the 4 digit syntax YYMM. For data from May 1993 forward, search using the syntax YYYYWW.

Any controlled vocabulary term (either a major or a minor heading) can accompany a subheading for greater specificity. Only one subheading is permitted per subject heading. When combined with a subject heading, subheadings give a very precise idea of what an article covers. Subheadings were used prior to 1993 only.

The ISBN (IB) field contains the International Standard Book Number (ISBN) for a book or monographic publication.

The ISBN (IB) field appears as a 10-digit number and may contain 13-digit number if available.

The Identifier (ID) field contains "Free language terms" which are uncontrolled indexing terms. Identifiers provide specificity in indexing that is not available using controlled vocabulary, and include the natural language of the author, state-of-the-art terminology, and utilization of proper and trade names.

Up to six free language terms can be assigned to each record. These terms are an integral part of the EI indexing system and, in many cases, subsequently become part of EI's controlled vocabulary.

Individual words from the Identifiers are entered into the index. Enter individual words to view the index.

The Institution (IN) field contains name of the organization with which the first author is affiliated, along with the location of the organization, including city, state or province, and country.

Enter the single most descriptive word in the institution (e.g. enter "harvard," not "university.")

The Issue Part field (IP) contains the Issue and/or part for a particular volume of a journal. The IP field usually displays as part of the Source (SO) field.

The ISSN (IS) field contains the International Standard Serial Number (ISSN), a standard international code which uniquely identifies a serial title.  The ISSN appears as a number separated by hyphens.  ISSNs have been used in EI records since April, 1979. Use hyphens when you enter the ISSN you wish to search.

The Journal Abbreviation (JA) field contains the abbreviated title of an individual journal issue. The JA field usually displays as part of the Source (SO) field.

The Journal Issue (JI) field contains information relating to the journal issue of the document as it appears with the publication. The Journal Issue field displays in the Source (SO) field.

The Journal Name field contains the full name of the journal in which an article was published. This field displays as part of the Source (SO) field.

Journal names are indexed as phrases -- to view journal titles in the index, enter as many of the words or letters in a journal name as are needed to distinguish it from other journals: e.g. enter "cognitive" for "Cognitive Science."

The Journal Translated Name (JT) field contains the translated title of an individual journal issue.

The Journal Word (JX) field contains individual words for every journal name in Compendex*Plus. Stopwords such as "the" or "of" are not included. This field is used to retrieve every occurrence of a journal which includes a particular word, such as "engineering."

The Language (LG) field contains the language(s) of publication of an article.

For a complete list of languages, refer to the Languages limit or view the index. See "Database Index Displays" in the Ovid Web Gateway Help for details on viewing and using a field index.

The Original Title (OT) field contains non-English titles in the original language. If the original title was in a non-Roman alphabet, then the OT is transliterated.

When searching for French titles, omit article prefixes (e.g. enter "heure" not "l'heure".)

The Publisher (PB) field contains the publisher information for any non-journal publications, such as conference and monographic citations.  In citing conference literature, the name, place and date of the conference is provided. This field displays as part of the Source (SO) field.

The Publisher Copyright (PC) index contains publisher information and it will be display at the end of Abstract (AB) field if available.

The Publisher Copyright (PC) is a word indexed.

The first page on which an article appears is indexed in the Page (PG) field. Often a journal title combined with the beginning page number is enough to locate a citation. This field displays as part of the Source (SO) field.

The Preferred Journal Name (PJ) field contains the preferred name of the journal in which an article was published. This field displays as part of the Source (SO) field, but will only be displayed if the Journal Name (JN) or Conference Proceeding (CP) is not available.

The Part Number field (PN) contains the part number for a particular journal. The PN field usually displays as part of the Source (SO) field.

The Publication Type (PT) field is used to describe the type of source publications from which indexed papers are taken. The following sixteen publication types are currently in use: Article, Book, Conference Paper, Conference Proceeding, Conference Review, Dissertation, Editorial, Erratum, Journal, Letter, Note, Proceeding, Report, Review, Short Survey, Trade Journal.

Enter the letter "a" to quickly browse the PT index for all document types.

The Sponsor (SA) field contains the names and locations of up to six organizations credited with sponsoring a conference. 

Individual words from the SA field are posted to the index.  Enter the most descriptive word for an organizational name to search for the Sponsor.  The word "sponsor" can also be searched in this field to retrieve all citations with a sponsor.

The Subject Headings (SH) field contains up to nine controlled vocabulary terms used to index the content of a document in the most specific and consistent way possible. Subject Headings which describe the major point, or focus of an article, are preceded with an asterisk (*).

Prior to 1993 Subject Headings were selected from close to 13,000 combinations of terms listed alphabetically in the EI Vocabulary. Beginning in 1993 Subject Headings are selected using the EI Thesaurus.

Subject Headings are indexed as phrases and should be searched as they appear in the EI Reference Sources.

The Source (SO) field includes a display of all the basic information needed to locate a citation, including the Journal Name (JN) or Monograph Title, Preferred Journal Name (PJ), Publisher (PB), Volume (VO), Part Number (PN), Issue Part (IP) and Date of Publication (DP), Page (PG) and Year of Publication (YR).

The Title (TI) field contains the English language version of a title. If the document is written in a language other than English, an English language translation is provided in this field.

For documents which were not written in English, the original or transliterated title usually appears in the Original Title field.

The Trade Journal (TJ) field contains information relating to the trade journal of the document as it appears with the publication. The Trade Journal field displays in the Source (SO) field.  

The Text Word (TW) field is an alias for all of the fields which contain text words and which are appropriate for a free text search. The Text Word fields in Compendex*Plus include the Title (TI), Abstract (AB), and Identifier (ID) fields.

This identifier will be supplied by the publisher for records added or updated in the last quarter of 2016 – present (e.g. http://arxiv.org/abs/1508.00332v5).

There are 2 formats of ArXiv Identifier, please see this link for further details - https://arxiv.org/help/arxiv_identifier

The Year of Publication(YR) field contains the year in which the article or monograph was published.

The year is normally displayed as part of the Source (SO) field.