TY  - BOOK
AU  - Harary,Frank
AU  - Norman,Robert Z.
AU  - Cartwright,Dorwin
TI  - Structural models : : an introduction to the theory of direct graphs / 
PY  - 1965///
CY  - New York
PB  - John Wiley and Sons
KW  - TEORIA DE GRAFOS
KW  - DIGRAPHS
KW  - ACYCLIC DIGRAPHS
ER  -