@article{GDZPPN002477378,
title = {On the Diophantine Equation x2 + D = 4yq.},
journal = {Monatshefte f\"ur Mathematik},
volume = {75},
year = {1971},
pages = {136-143},
zbl = {0216.04003},
url = {http://dml.mathdoc.fr/item/GDZPPN002477378}
}
Ljunggren, W. On the Diophantine Equation x2 + D = 4yq.. Monatshefte für Mathematik, Tome 75 (1971) pp. 136-143. http://gdmltest.u-ga.fr/item/GDZPPN002477378/