TY  - GEN
AU  - Tonchev, Vladimir D
TI  - Combinatorial configurations desing, codes, graphs
SN  - 0582994837
U1  - 511' .6 
PY  - 1988///
CY  - New York
PB  - Longman Scientific&Technical
KW  - Graph theory
N1  - Cuprinde bibliogr. si index
ER  -