Category:Articles with invalid ISSNs
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The most likely reason is a bad checksum, (see ISSN) which probably means there is a typing error in the ISSN. Also, ISSNs that are not eight digits in a 4-4 pattern (i.e.: ISSN 1234-5678) will return an error message. Use an upper-case "X", not a lower-case "x", if "X" is the final character in the ISSN. The two groups of four characters are joined with a hyphen, not a dash.
See also Category:CS1 errors: ISSN
Pages in category "Articles with invalid ISSNs"
The following 12 pages are in this category, out of 12 total. This list may not reflect recent changes (learn more).