TY  - BOOK
AU  - Wilson, Robert
TI  - Graphs, colourings, and the four-colour theorem
SN  - 9780198510628
SN  - 200231918
U1  - 511.5 WIL 
PY  - 2002///
CY  - Oxford
PB  - Oxford University Press
KW  - Four-color problem
KW  - Graph coloring
N1  - Includes bibliographical references (p. 136-138) and index
ER  -