TY  - GEN
AU  - Harary, Frank
AU  - Norman, Robert Z
AU  - Cartwright, Dorwin
TI  - Structural models: an introduction to the theory of directed graphs
U1  - 519.1 
PY  - 1965///
CY  - New York ; London ; Sydney
PB  - John Wiley & Sons
KW  - Teoria grafurilor
KW  - Analiza combinatorica
N1  - Contine bibliogr. si index
ER  -