TY  - BOOK
AU  - Wallis, W.D.
AU  - George, J.C.
TI  - Introduction to combinatorics
SN  - 9781439806227
U1  - 511.6 
PY  - 2011///
CY  - Boca Raton
PB  - Crc Press
KW  - Combinatorial analysis -- Textbooks
ER  -