TY  - BOOK
AU  - Saaty,Thomas L.
AU  - Kainen,Paul C.
TI  - The four-color problem: assaults and conquest 
SN  - 0070543828
U1  - 511.5 19
PY  - 1977///
CY  - New York
PB  - McGraw-Hill International Book Co.
KW  - Four-color problem
N1  - Includes index; Includes Bibliography: p. 197-211
ER  -