@article{JRAM_1972__252_151172,
     author = {H. Hasse and S. Chowla},
     title = {Application of a theorem of {Hasse} to a problem on diophantine equations.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {44--50},
     publisher = {mathdoc},
     volume = {252},
     year = {1972},
     zbl = {0237.10014},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1972__252_151172/}
}