TY  - BOOK
AU  - Robinson,D.F.
AU  - Robinson,D.F.
AU  - Foulds,L.R.
TI  - Digraphs: theory and techniques 
PY  - 1980///
CY  - New York
PB  - Gordon and Breach
KW  - Directed graphs
KW  - Digraphs
N1  - Includes index
ER  -