TY  - BOOK
AU  - Frank Harary
AU  -  Robert  Z. Norman  Dorwin Cartwright
TI  - Structural models : An introduction to the theory of directed graphs
SN  - 0-471-35130-X
U1  - 516.6 
PY  - 1965///
CY  - New York
PB  - John Wiley and Sons Inc
N1  - Frank Harary; Robert  Z. Norman & Dorwin Cartwright: Structural models : An introduction to the theory of directed graphs.  New York.  John Wiley and Sons Inc, 1965. 0-471-35130-X--(516.6HAR)
ER  -