TY  - BOOK
AU  - Petrich,Mario
TI  - Categories of algebraic systems: vector and projective spaces, semigroups, rings, and lattices 
SN  - 038707998X
PY  - 1976///
CY  - Berlin
PB  - Springer-Verlag
KW  - Algebra, Abstract
KW  - Categories ( Mathematics)
N1  - Includes bibliography and index; Open access
ER  -