TY  - GEN
AU  - Fritsch, Rudolf
AU  - Peschke, Julie - trans.
AU  - Fritsch, Gerda
TI  - The four-color theorem: history, topological foundations, and idea of proof
SN  - 0387984976
U1  - 511.5 
PY  - 1994///
CY  - New York
PB  - Springer
KW  - Graph theory
ER  -