TY  - BOOK
AU  -  Lipschutz,Seymour  .
AU  - Lipson,Marc Lars  .
TI  - Two thousand solved problems in discrete mathamatics / 
T2  - Schaum`s solved problems, 
U1  - 511.3 
PY  - 1992///
CY  - New York : 
PB  - Mc-Graw Hill , 
KW  - Discrete mathamatics
ER  -