Gaida, Ju. R.; Eremenko, A. E. Über den Randoperator in Booleschen Algebren mit Abschließung. (Russian) Zbl 0311.54004 Ukr. Mat. Zh. 26, 806-809 (1974). Page: −5 −4 −3 −2 −1 ±0 +1 +2 +3 +4 +5 Show Scanned Page Cited in 1 Document MSC: 54A05 Topological spaces and generalizations (closure spaces, etc.) 06E05 Structure theory of Boolean algebras PDFBibTeX XMLCite \textit{Ju. R. Gaida} and \textit{A. E. Eremenko}, Ukr. Mat. Zh. 26, 806--809 (1974; Zbl 0311.54004)