S 1 is generally a representative supplement. Only the first phase 1 supplements S0, and the multi-phase 1 uses S 1, S2, ...

Some periodicals are monthly, which can only issue 12 a year, but there are many contributors. Sometimes, magazines publish one or two supplements. Although supplements are also regular periodicals, many units do not recognize supplements.

Extended data

"Article number" consists of 5 ***20 digits, such as international standard serial number, publication year, issue number and page number of each periodical, and its structure is xxxx-xxxx (yyyy) nn-pppp-cc. Among them, XXXX-XXXX is the international standard serial number of the journal where the article is located, YYYY is the publication year of the journal where the article is located, NN is the issue number of the journal where the article is located, PPPP is the page number of the journal where the first page of the article is located, CC is the page number of the article, and "-"is a hyphen.

The period is a double digit. When the actual period is a number, you need to fill in "0" in front of it, for example, 1 period is "0 1".

The page number on the first page of the article is 4 digits; If the actual page number is less than 4 digits, it should be preceded by "0", such as "0 139" on page139. The number of pages in the article is two digits; If the actual number of pages is less than two digits, a "0" should be added before it. For example, 9 pages is 09, and turning pages doesn't count.

The article number is given by the editorial department of each journal. The identification of Chinese article numbers is "article number:" or "[article number]", as published in Library and Information Knowledge No.2+0997, page 13 ~ 17 (page * * *), entitled "Reflections on Social and Economic Informatization" (Author: Yan Yimin).