TY  - BOOK
AU  - Chartrand, G
AU  - Lesniak, L
TI  - Graphs and digraphs
SN  - 9781439826270
U1  - 519.172.3 
PY  - 2011///
CY  - Boca Raton
PB  - CRC
KW  - DIAGRAPHS
KW  - GRAPHS
KW  - PLANARGRAPHS
ER  -