CESNET/perun — pull request #315 by zlamalp (2014-06-02 10:08:44+00:00)
Title: CABINET: pubs with same ISBN are no longer considered same

- Publications with same ISBN are not considered same anymore.
It caused confusion to users, when they were automatically added
as authors of someone's else publication.
It's common, that reported publication is in fact an article in
publication, so many reports can have same ISBN.