@article{TM_1946_13_a0,
     author = {N. Erougin},
     title = {Reducible systems},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {3--96},
     publisher = {mathdoc},
     volume = {13},
     year = {1946},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1946_13_a0/}
}