@article{10_1017_S0017089500001130,
     author = {Feller, E. H. and Gantos, R. L.},
     title = {Completely right injective semigroups that are unions of groups{\textdagger}},
     journal = {Glasgow mathematical journal},
     pages = {43--49},
     year = {1971},
     volume = {12},
     number = {1},
     doi = {10.1017/S0017089500001130},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500001130/}
}