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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 25, No. 6, pp. 841–843, November–December, 1973.
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Ten, V.S. Bipositive projectors in a partially ordered vector space((c)-density in a K-lineal). Ukr Math J 25, 702–703 (1973). https://doi.org/10.1007/BF01090809
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DOI: https://doi.org/10.1007/BF01090809