The Four-color theorem :
Fritsch, Rudolf
The Four-color theorem : History, topological foundations and idea of proof / Rudolf Fritsch and Gerda Fritsch - New York Springer-Verlag 1998 - xvi, 260p
9780387984971
Mathematics
Four-color problem
511.5 / FRI
The Four-color theorem : History, topological foundations and idea of proof / Rudolf Fritsch and Gerda Fritsch - New York Springer-Verlag 1998 - xvi, 260p
9780387984971
Mathematics
Four-color problem
511.5 / FRI