@article{TM_1977_143_a4,
     author = {B. S. Kashin},
     title = {Some properties of orthogonal convergence system},
     journal = {Trudy Matematicheskogo Instituta imeni V.A. Steklova},
     pages = {68--87},
     publisher = {mathdoc},
     volume = {143},
     year = {1977},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/TM_1977_143_a4/}
}