TY  - DATA
AU  - Rudolf Fritsch, Gerda Fritsch
TI  - The Four-Color Theorem
SN  - 9781461217206
PY  - 1998///
PB  - Springer New York
KW  - Mathematics and Statistics
UR  - https://doi.org/10.1007/978-1-4612-1720-6
ER  -