TY  - BOOK
AU  - Liu,C.L.
TI  - Elements of discrete mathematics
SN  - 0070381313 (Hardcover)
AV  - QA76.9.M35 LIU 
PY  - 1977///
CY  - New York
PB  - McGraw-Hill
KW  - Combinatorial analysis
KW  - Algebra, Abstract
N1  - Includes bibliographical references
ER  -