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@article{MV_1969_21_3_a8, author = {B. N. Rachajsky}, title = {On the {Monge-Ampere} differential equation $rt - s^{2} + \lambda^{2}(x,y)=0$}, journal = {Matemati\v{c}ki vesnik}, pages = {317 }, publisher = {mathdoc}, volume = {21}, number = {3}, year = {1969}, url = {http://geodesic.mathdoc.fr/item/MV_1969_21_3_a8/} }
B. N. Rachajsky. On the Monge-Ampere differential equation $rt - s^{2} + \lambda^{2}(x,y)=0$. Matematički vesnik, Tome 21 (1969) no. 3, p. 317 . http://geodesic.mathdoc.fr/item/MV_1969_21_3_a8/