TY  - BOOK
AU  - Berge C Ed.
AU  -  Chvatal V Ed.
TI  - Topics on perfect graphs
T2  - Annals of Discrete Mathematics; 21
U1  - B44, M4;1 
PY  - 1684///
CY  - Amsterdam
PB  - North-Holland         
KW  - Perfect graphs
ER  -