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@article{PIM_1935_Tom_IV_a8, author = {H. Lemke}, title = {Bemerkungen zur {Integration} der {Differentialgleichung} ( {dY/dx} )^2 + {Y^2} = g(x)^2}, journal = {Publications de l'Institut Math\'ematique}, pages = {201 }, publisher = {mathdoc}, volume = {Tom_IV}, year = {1935}, url = {http://geodesic.mathdoc.fr/item/PIM_1935_Tom_IV_a8/} }
H. Lemke. Bemerkungen zur Integration der Differentialgleichung ( dY/dx )^2 + Y^2 = g(x)^2. Publications de l'Institut Mathématique, Tom_IV (1935), p. 201 . http://geodesic.mathdoc.fr/item/PIM_1935_Tom_IV_a8/