@article{SF_1977__14_186374,
     author = {G. Thierrin and G. Thomas},
     title = {.....-simple reflective semigroups.},
     journal = {Semigroup forum},
     pages = {283--294},
     publisher = {mathdoc},
     volume = {14},
     year = {1977},
     zbl = {0372.20047},
     url = {http://geodesic.mathdoc.fr/item/SF_1977__14_186374/}
}