TY  - GEN
AU  - Francis,George K
TI  - A topological picturebook
SN  - 0387964266
U1  - 514 
PY  - 1987///
CY  - New York
PB  - Springer-Verlag
KW  - Topology
KW  - Graphic methods
N1  - Cuprinde bibliografie si index
ER  -