@article{TM_1969_105_a11,
     author = {T. S. Pigolkina},
     title = {On the theory of weight classes},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {201--212},
     year = {1969},
     volume = {105},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1969_105_a11/}
}