citations templates that contain
|issn=
and/or
|eissn=
are checked to ensure that the
ISSN
is the proper length (eight digits) and that the final
check digit
validates according to the ISSN specification. Only one each of ISSN and eISSN is allowed in this field because the whole
|issn=
and
|eissn=
values are included in the citation's
COinS
metadata
. See also
Wikipedia:COinS
. (If relevant, they can be specified using
|id=
?????:Tlp
?????:Tlp
instead.)
The ISSN and eISSN are always rendered as two four-digit numbers separated with a hyphen.
To resolve this error, ensure that the
|issn=
and
|eissn=
values are correct, that only one value per parameter is used, and that no other text is included (allowable characters are 0?9, X, and -). If the check-digit is a lowercase 'x', change it to an uppercase 'X'.
In very rare cases, publishers have released works with a malformed identifier. If you are certain that a non-conforming identifier truly corresponds to the published work, then you can add
accept-this-as-written markup
around the identifier to suppress the error message. In some cases, works may have been reissued with a corrected identifier. Use the corrected one when possible.
???? ?? ????? ?? ?????? ???????? ????????:?????? ?????: ISSN (0 ????).
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