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@article{DAN_1983_273_4_a6, author = {V. L. Levin}, title = {Continuous utility theorem for closed preorders on a metrizable $\sigma$-compact space}, journal = {Doklady Akademii Nauk}, pages = {800--804}, publisher = {mathdoc}, volume = {273}, number = {4}, year = {1983}, language = {ru}, url = {http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a6/} }
V. L. Levin. Continuous utility theorem for closed preorders on a metrizable $\sigma$-compact space. Doklady Akademii Nauk, Tome 273 (1983) no. 4, pp. 800-804. http://geodesic.mathdoc.fr/item/DAN_1983_273_4_a6/