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| | International Standard Serial Number - Wikipedia, the free encyclopedia |
 | | ISSN codes are assigned by a network of ISSN National Centres, usually located at National Libraries and coordinated by the ISSN International Centre based in Paris. |
 | | Since the ISSN applies to an entire periodical, a new identifier, the SICI was built on top of it, to allow referencing specific volumes, articles, or other identifiable components (like the table of contents). |
 | | Though an ISSN checking facility is available, this is a tool for checking the validity of an ISSN number format, not for querying the ISSN Register to determine what periodical the input number is associated with. |
| en.wikipedia.org /wiki/ISSN (488 words) |
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