$\sigma$-inverse semigroups
Novi Sad Journal of Mathematics, Tome 14 (1984).

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@article{NSJOM_1984__14__a17,
     author = {Bogdanovi\'c Stojan},
     title = {$\sigma$-inverse semigroups},
     journal = {Novi Sad Journal of Mathematics},
     pages = {197-200},
     publisher = {mathdoc},
     volume = {14},
     year = {1984},
     url = {http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a17/}
}
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%I mathdoc
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Bogdanović Stojan. $\sigma$-inverse semigroups. Novi Sad Journal of Mathematics, Tome 14 (1984). http://geodesic.mathdoc.fr/item/NSJOM_1984__14__a17/