@article{MT_1987_9_a11,
     author = {M. V. Talalaev},
     title = {Classes of differential forms that are invariant under quasiconformal mappings},
     journal = {Matemati\v{c}eskie trudy},
     pages = {149--151},
     publisher = {mathdoc},
     volume = {9},
     year = {1987},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MT_1987_9_a11/}
}