@article{1183493098, author = {Dickson, L. E.}, title = {The forms $ax^2 + by^2 + cz^2 $ which represent all integers}, journal = {Bull. Amer. Math. Soc.}, volume = {35}, number = {6}, year = {1929}, pages = { 55-59}, language = {en}, url = {http://dml.mathdoc.fr/item/1183493098} }
Dickson, L. E. The forms $ax^2 + by^2 + cz^2 $ which represent all integers. Bull. Amer. Math. Soc., Tome 35 (1929) no. 6, pp. 55-59. http://gdmltest.u-ga.fr/item/1183493098/