On the Diophantine Equation $Cx^2 + D = 2y^n$.

W. Ljunggren, “On the Diophantine Equation $Cx^2 + D = 2y^n$”., Math. Scand., vol. 18, pp. 69–86, Jun. 1966, doi: 10.7146/math.scand.a-10781.