TY  - BOOK
AU  - Liu, Chung Laung.
TI  - Elements of discrete mathematics
T2  - McGraw-Hill Computer Science Series
U1  - 511.6 
PY  - 1977///
CY  - New York
PB  - McGraw-Hill
KW  - Algebra abstracta
KW  - Analisis combinatorio
ER  -