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/