@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/}
}