@article{MZM_2009_85_3_a9,
     author = {L. N. Orlova},
     title = {The {Geometry} of a {Quasilinear} {System} of {Two} {Partial} {Differential} {Equations} {Containing} the {First} and the {Second} {Partial} {Derivatives} of {Two} {Functions} in {Two} {Independent} {Variables}},
     journal = {Matemati\v{c}eskie zametki},
     pages = {421--432},
     publisher = {mathdoc},
     volume = {85},
     number = {3},
     year = {2009},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_2009_85_3_a9/}
}