TY  - RPRT
A1  - Schweigert, Dietmar
A1  - Wismath, S.L.
T1  - Derived Varieties of Semigroups and Groupoids
T3  - Preprints (rote Reihe) des Fachbereich Mathematik - 281 
Y1  - 1996
UR  - https://kluedo.ub.uni-kl.de/frontdoor/index/index/docId/4889
UR  - https://nbn-resolving.org/urn:nbn:de:hbz:386-kluedo-48896
ER  -