@article{GDZPPN002358867, title = {On a problem of Frobenius.}, journal = {Mathematica Scandinavica}, volume = {58}, year = {1986}, pages = {161-175}, zbl = {0607.10038}, url = {http://dml.mathdoc.fr/item/GDZPPN002358867} }
Marstrander, Otto. On a problem of Frobenius.. Mathematica Scandinavica, Tome 58 (1986) pp. 161-175. http://gdmltest.u-ga.fr/item/GDZPPN002358867/