Bipositive projection operators in partially ordered vector spaces (density and extremal properties)
English version (Springer): Ukrainian Mathematical Journal 25 (1973), no. 5, pp 577-579.
Citation Example: Ten V. S. Bipositive projection operators in partially ordered vector spaces (density and extremal properties) // Ukr. Mat. Zh. - 1973. - 25, № 5. - pp. 693—695.
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