@article{MZM_1979_25_1_a7,
     author = {G. G. Magaril-Il'yaev},
     title = {Intermediate derivatives},
     journal = {Matemati\v{c}eskie zametki},
     pages = {81--96},
     publisher = {mathdoc},
     volume = {25},
     number = {1},
     year = {1979},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1979_25_1_a7/}
}