TY  - JOUR
AU  - Kopeček, Oldřich
AU  - Novotný, Miroslav
TI  - On some invariants of unary algebras
JO  - Czechoslovak Mathematical Journal
PY  - 1974
SP  - 219
EP  - 246
VL  - 24
IS  - 2
UR  - http://geodesic.mathdoc.fr/articles/10.21136/CMJ.1974.101234/
DO  - 10.21136/CMJ.1974.101234
LA  - en
ID  - 10_21136_CMJ_1974_101234
ER  -