TY  - BOOK
AU  - Garey,M.R & Johnson,D.S
ED  - Johnson, D.S
TI  - Computers & intractability: guide to the theory of NP-completeness
SN  - 0716710455
U1  - 18 
PY  - 1979///
CY  - New York
PB  - W.H. Freeman & Co.
ER  -