TY  - BOOK
AU  - Christofides, Nicos., ed.,[et al].
TI  - Combinatorial optimization
T2  - Wiley Interscience Publication
SN  - 0471997498
U1  - 511.6 
PY  - 1979///
CY  - New York
PB  - John Wiley & Sons
N1  - Lecture given at the Summer School in Combinatorial Optimization, Sogesta,1977
ER  -