@article{GDZPPN002190699,
title = {Diophantine equations of the form x2 + D = yn.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {272},
year = {1975},
pages = {385-389},
zbl = {0303.10014},
url = {http://dml.mathdoc.fr/item/GDZPPN002190699}
}
Brown, Ezra. Diophantine equations of the form x2 + D = yn.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 385-389. http://gdmltest.u-ga.fr/item/GDZPPN002190699/