Schubert András, Zsindely Sándor, Glänzel Wolfgang, Braun Tibor (szerk.): A tudományos publikációs tevékenység mutatószámai az MTA természettudományi, műszaki, orvostudományi és agrártudományi kutatóhelyein 1976–1980 (A MTAK Informatikai És Tudományelemzési Sorozata 2., 1982)

VII. FÜGGELÉK - 2. A „Journal Citation Reports" által nyilvántartott folyóiratok „impact factorai"

104 JCR " in an abbreviated form. Abbreviation of titles in the JCR usually ignores subtitles and the title run-ons (Acta medica clinica

—an international journal of medical practice. Zeitschrift fur Neurologische Forschung und Angewandte Gebiete). In alphabetic listing of journals, abbreviations are alphabetized letter by letter, with a space regarded as a 'letter' preceding A and a hyphen as a 'letter' preceding A but following a space. In such alphabetic listings of 'journal titles' in the SCI® JCR, note that it is the abbreviation, not the full journal title, that is alphabetized. An Abbreviated-to-Full Titles of Citing/Cited Journals list begins on page 57 A

. Reference. The mention or description of one document (A) in another document (B), to indicate a source of information, to provide support for a point of view, to lend authority to some statement of fact, etc. Document B is said to make reference to document A; document A is said to be cited by document B. Reference is also used for the document description or bibliographic data given in making the reference (Lederberg I. J. Bact. 63

:399, 1952). Reference is made, that is, references are given, in footnotes, and more frequently among bibliographic endnotes or in bibliographic listings at the end of an article. From such references are extracted the citations which become main-entries in the Citation index. Rest. A column heading in the Citing and Cited Journal Packages of the JCR, used to mean Total Citations of Articles Published in All Previous Years.' Since the format of the JCR allows a chronological distribution of citation dates over a ten-year period, Rest means 'published prior to the decade just ended.' Self-Citation. Self-citation of journals occurs when an article in journal X cites another article previously or simultaneously published in journal X. Self-citations are contained in about 20% of a journal's references. Self-Citation Rate. Self-citations expressed as a percentage of all citations. There are two selfcitation rates, the self-citing and self-cited rates. The self-citing rate relates a journal's self-citation to its total references. The self-cited rate relates a journal's self-citations to the number of times it is cited by all journals including itself. For example journal X made reference to 10000 items, including 2000 items it itself had published. Its selfciting rate is 2/10 or 20%. On the other hand, journal X was cited 15000 times in the references of all journals, including its own. Its self-cited rate is 2/15 or 13.5%. Source Index. The Source Index of the SCI*, SSCI

" or A&HCI

" gives a complete bibliographic description of all source items processed for the SCI, SSCI or A&HCI. Items are arranged alphabetically by name of first author: all coauthors are cross-referenced to first authors. The Source Index is, thus, an alphabetic index by author of all items published by SCI- , SSCI- or A&HCI-covcted journals during a particular year. Source Item. Called also source document andsource article, a source item is an item published in one of the source journals processed for the Science Citation Index

* (SCI*), the Social Sciences Citation Index® (SSCI

) or the Ans & Humanities Citation Index(A&HCI

). In the JCR only original articles, technical notes and review articles are counted as source items, except in the case of the following journals, whose meeting abstracts are admitted as source items in impact-factor and immediacy-index calculation: Federation Proceedings, Bulletin of the American Physical Society, Clinical Research, Transactions of The American Nuclear Society, and EOS

—Transactions of the American Geophysical Union. Source Journal. A journal that is processed for the SCI, SSCI or A&HCI , so called because it is the source of published items processed for compilation of the three sections of the SCI, SSCI or A&HCI. In the JCR a source journal is a citing journal. Times Cited. The JCR describes relationships between journals. It is, however, based on citation links between articles. The following explanations of 'times cited' may be unnecessary for most users. Some, however, may need the information, and it is given in some detail in the interest of whatever differentiation research may require. Times Cited: Authors. In the case of authors, 'times cited' is the sum of the citation of their cited items, as described below, including journal articles, books, etc. Times Cited: Journals. In the case of journals, 'times cited' is based on citations of articles, as described below. It is a cumulation of the number of times a particular journal has been named in citation of different articles in references of individual source items. Times Cited: Articles. As elsewhere in these definitions, the term articles is used broadly for 'journal items,' and includes technical com-