@article{GDZPPN002354381, title = {On a conjecture of G. Bol.}, journal = {Mathematica Scandinavica}, volume = {40}, year = {1977}, pages = {194-196}, zbl = {0373.53002}, url = {http://dml.mathdoc.fr/item/GDZPPN002354381} }
Fabricius-Bjerre, Fr. On a conjecture of G. Bol.. Mathematica Scandinavica, Tome 40 (1977) pp. 194-196. http://gdmltest.u-ga.fr/item/GDZPPN002354381/