TY  - BOOK
AU  - Pultr A
AU  -  Trnkova V
TI  - Combinatorial algebraic and topological representations of groups semigroups  and categories
U1  - B27, M0 
PY  - 1980///
CY  - New York    
PB  -  North-Holland        
KW  - Group theory
N1  - Bibliography 353-366p
ER  -