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@article{DAN_1977_235_6_a4, author = {A. V. Levichev}, title = {On a connected preorder}, journal = {Doklady Akademii Nauk}, pages = {1256--1259}, publisher = {mathdoc}, volume = {235}, number = {6}, year = {1977}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1977_235_6_a4/} }
A. V. Levichev. On a connected preorder. Doklady Akademii Nauk, Tome 235 (1977) no. 6, pp. 1256-1259. http://geodesic.mathdoc.fr/item/DAN_1977_235_6_a4/