TY  - JOUR
AU  - Vagn Lundsgaard Hansen
TI  - The Magic World of Geometry - III. The Dirac String Problem.
JO  - Elemente der Mathematik
PY  - 1994
SP  - 149
EP  - 154
VL  - 49
IS  - 1
PB  - mathdoc
UR  - http://geodesic.mathdoc.fr/item/ELMA_1994__49_1_141568/
ID  - ELMA_1994__49_1_141568
ER  -