TY  - GEN
AU  - Liu, C.L.
TI  - Introduction to combinatorial mathematics
U1  - 512.5 
PY  - 1968///
CY  - New York
PB  - McGraw-Hill Book
KW  - Analysis
KW  - Permutations
KW  - Differential equations
KW  - Linear programming
KW  - Mathematics
ER  -