@article{DAN_1984_279_3_a1,
     author = {K. S. Demirchyan and J. V. Rakitskii},
     title = {On the filtration of components with large derivatives in differential systems},
     journal = {Doklady Akademii Nauk},
     pages = {525--528},
     publisher = {mathdoc},
     volume = {279},
     number = {3},
     year = {1984},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DAN_1984_279_3_a1/}
}