TY  - GEN
AU  - P.Grmald,Ralph
AU  - P.Grmald, Ralph.
TI  - Discrete and combinatorial mathematics: an applied introduction 4th edition 
SN  - 8178086514
SN  - 978817808
U1  - 510 
PY  - 1999///
CY  - [S.l.]
PB  - Adison-Wesley Longman, Inc,1999
ER  -