@article{TRSPY_1999_225_a25,
     author = {S. P. Tsarev},
     title = {On {Darboux-Integrable} {Nonlinear} {Partial} {Differential} {Equations}},
     journal = {Informatics and Automation},
     pages = {389--399},
     publisher = {mathdoc},
     volume = {225},
     year = {1999},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TRSPY_1999_225_a25/}
}