As you probably all know, our friend and mentor Petr Hájek passed away last December in Prague. We have prepared an obituary for the journal Fuzzy Sets and Systems, that you can find as an Article in Press version in this link:
It seems the access to the pdf file is open (at least until the obituary is included in an issue). Should you wish to open it later, anybody who does not have access can ask to either of us (firstname.lastname@example.org, email@example.com) and we will provide you with a copy.
Our best wishes,
Zuzana Hanikova and Lluis Godo