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T. O. Banakh, S. Dimitrova, and O. V. Gutik, “The Rees-Suschkewitsch Theorem for simple topological semigroups”, Mat. Stud., 31:2 (2009), 211–218
O. Gutik, J. Lawson, and D. Repov., “Semigroup closures of finite rank symmetric inverse semigroups”, Semigroup Forum, 78:2 (2009), 326–336
O. V. Gutik, and D. Repovš, “On linearly ordered H-closed topological semilattices”, Semigroup Forum, 77:3 (2008), 474–481
O. V. Gutik, and D. Repovš, “On countably compact 0-simple topological inverse semigroups”, Semigroup Forum, 75:2 (2007), 464–469