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Translated from Matematicheskie Zametki, Vol. 31, No. 1, pp. 93–112, January, 1982.
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Labsker, L.G. Korovkin sets in Banach space for sets of linear functionals. Mathematical Notes of the Academy of Sciences of the USSR 31, 47–56 (1982). https://doi.org/10.1007/BF01146268
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DOI: https://doi.org/10.1007/BF01146268