TY  - BOOK
AU  - Wiitala,Stephen A..
TI  - Discrete mathematics: aunified approach / 
SN  - 0070701695
U1  - 510 
PY  - 1987///
CY  - New York : 
PB  - McGraw-Hill , 
KW  - MATHEMATICS-1961-
N1  - NULL
ER  -