@article{IM2_1981_16_1_a8,
     author = {V. Kh. Salikhov},
     title = {On differential irreducibility of a~class of differential equations},
     journal = {Izvestiya. Mathematics},
     pages = {165--189},
     year = {1981},
     volume = {16},
     number = {1},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1981_16_1_a8/}
}