TY  - BOOK
AU  - Polya G.
AU  - Read R.C. -jt auth
TI  - Combinational enumeration of groups, graphs, and chemical compounds : With 17 illustrations
SN  - 0-387-96413-4
U1  - 511.5 
PY  - 1987///
CY  - NY
PB  - Springer-Verlag
KW  - Combinatorial enumeration problems
ER  -