@article{MMO_1990_53_a2,
     author = {M. M. Malamud},
     title = {On transformation operators for ordinary differential equations},
     journal = {Trudy Moskovskogo matemati\v{c}eskogo ob\^{s}estva},
     pages = {68--97},
     publisher = {mathdoc},
     volume = {53},
     year = {1990},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MMO_1990_53_a2/}
}