@article{FAA_1985_19_2_a0,
     author = {A. A. Davydov},
     title = {Normal form of a differential equation, not solvable for the derivative, in a neighborhood of a singular point},
     journal = {Funkcionalʹnyj analiz i ego prilo\v{z}eni\^a},
     pages = {1--10},
     publisher = {mathdoc},
     volume = {19},
     number = {2},
     year = {1985},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/FAA_1985_19_2_a0/}
}