@article{GDZPPN002083345,
title = {The Magic World of Geometry - III. The Dirac String Problem.},
journal = {Elemente der Mathematik},
volume = {49},
year = {1994},
pages = {149-154},
zbl = {0834.57007},
url = {http://dml.mathdoc.fr/item/GDZPPN002083345}
}
Hansen, Vagn Lundsgaard. The Magic World of Geometry - III. The Dirac String Problem.. Elemente der Mathematik, Tome 49 (1994) pp. 149-154. http://gdmltest.u-ga.fr/item/GDZPPN002083345/