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- Quasigroups and loops : introduction / Hala O. Pflugfelder . Berlin : Heldermann, 1990 . 147 s.
Dislocation Available Unavail./Only at library Issued Reservations IN - Sýkorová Mgr. 0 0/1 0 0 - Quasigroups and loops : theory and applications / edited by O. Chein, H.O. Pflugfelder, J.D.H. Smith . Berlin : Heldermann Verlag, c1990 . xii, 568 s.
Dislocation Available Unavail./Only at library Issued Reservations IN - Sýkorová Mgr. 0 0/1 0 0