"1"^^ . . . "A classification of one-element extensions of commutative semigroups is presented." . "N\u011Bmec, Petr" . . "One-element extensions of commutative semigroups"@en . "One-element extensions of commutative semigroups"@en . "3"^^ . "0001-7140" . "2" . "Kepka, Tom\u00E1\u0161" . . . "One-element extensions of commutative semigroups" . "One-element extensions of commutative semigroups" . "RIV/60460709:41310/11:54262!RIV12-GA0-41310___" . "Commutative semigroup, ideal, regular transformation"@en . . . . . "0" . "Acta Universitatis Carolinae: Mathematica et Physica" . . "3"^^ . "218349" . . . "52" . . "P(GA201/09/0296), Z(MSM0021620839)" . "41310" . . . "[D61F774BFCA9]" . . "Je\u017Eek, Jaroslav" . "CZ - \u010Cesk\u00E1 republika" . "RIV/60460709:41310/11:54262" . . "A classification of one-element extensions of commutative semigroups is presented."@en . .