TY  - BOOK
AU  - Hartsfield,Nora
AU  - Ringel,Gerhard
TI  - Pearls in graph theory: : a comprehensive introduction 
SN  - 0123285526
PY  - 1990///
CY  - Boston
PB  - : Academic Press
KW  - Graph theory
N1  - Includes index
ER  -