Geodesic
Qr-semigroups
Publications de l'Institut Mathématique, _N_S_29 (1981) no. 43, p. 15

Voir la notice de l'article provenant de la source eLibrary of Mathematical Institute of the Serbian Academy of Sciences and Arts

Here, we give the definition of $Q_r$-semigroup i.e., a semigroup in which every proper right ideal is a power joined semigroup and we give as well some characterizations of weakly commutative $Q_r$-semigroups, 
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     author = {Stojan Bogdanovi\'c},
     title = {Qr-semigroups},
     journal = {Publications de l'Institut Math\'ematique},
     pages = {15 },
     publisher = {mathdoc},
     volume = {_N_S_29},
     number = {43},
     year = {1981},
     language = {en},
     url = {http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a1/}
}
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Stojan Bogdanović. Qr-semigroups. Publications de l'Institut Mathématique, _N_S_29 (1981) no. 43, p. 15 . http://geodesic.mathdoc.fr/item/PIM_1981_N_S_29_43_a1/