Literature cited
V. S. Ten, “Bipositive projection operators in partially ordered vector spaces,” Ukr. Matem, Zh.,24, No.2 (1972).
L. V. Kantorovich, B. Z. Vulikh, and A. G. Pincker, Functional Analysis in Partially Ordered Spaces [in Russian], Gostekhizdat, Moscow (1950).
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Translated from Ukrainskii Matematicheskii Zhurnal, Vol.25, No. 5, pp. 693–695, September–October, 1973.
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Ten, V.S. Bipositive projection operators in partially ordered vector spaces (density and extremal properties). Ukr Math J 25, 577–579 (1973). https://doi.org/10.1007/BF01091956
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DOI: https://doi.org/10.1007/BF01091956