TY  - BOOK
AU  - Saaty,Thomas L.
AU  - Kainen,Paul C.
ED  - Dover Publications
TI  - The four-color problem: assaults and conquest 
SN  - 0486650928 
U1  - 511.56 23
PY  - 1986///
CY  - New York
PB  - Dover Publications
KW  - Four-color problem
N1  - Includes index; Bibliography: p. 197-211
ER  -