@article{DE_2006_42_10_a11,
     author = {V. N. Chetverikov},
     title = {Linearization method for the flatness problem and for finding the compatibility operator},
     journal = {Differencialʹnye uravneni\^a},
     pages = {1405--1415},
     publisher = {mathdoc},
     volume = {42},
     number = {10},
     year = {2006},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/DE_2006_42_10_a11/}
}