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Tiraspol'. Translated from Sibirskii Matematicheskii Zhurnal, Vol. 30, No. 2, pp. 185–191, March–April, 1989.
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Choban, M.M., Kalmutskii, L.I. A theorem of Nagata on lattices of semicontinuous functions. Sib Math J 30, 317–322 (1989). https://doi.org/10.1007/BF00971389
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DOI: https://doi.org/10.1007/BF00971389