The four-color theorem
Fritsch, Rudolf
The four-color theorem history, topological foundations, and idea of proof - New York Springer 1994 - xvi,260p. 24cm
0387984976
Graph theory
511.5 / FRI
The four-color theorem history, topological foundations, and idea of proof - New York Springer 1994 - xvi,260p. 24cm
0387984976
Graph theory
511.5 / FRI