@article{JRAM_1976__288_151799,
     author = {Ezra Brown},
     title = {The diophantine equation x2 + 3 = 7n.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {74--76},
     publisher = {mathdoc},
     volume = {288},
     year = {1976},
     zbl = {0333.10006},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1976__288_151799/}
}