@article{IM2_1992_39_2_a2,
     author = {A. G. Zavadskii},
     title = {Differentiation algorithm and classification of representations},
     journal = {Izvestiya. Mathematics},
     pages = {975--1012},
     year = {1992},
     volume = {39},
     number = {2},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/IM2_1992_39_2_a2/}
}