@article{ZNSL_1980_96_a27,
     author = {N. N. Yanenko},
     title = {On non-linear equations of a~variable type},
     journal = {Zapiski Nauchnykh Seminarov POMI},
     pages = {294--301},
     publisher = {mathdoc},
     volume = {96},
     year = {1980},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/ZNSL_1980_96_a27/}
}