@article{SF_1972__4_133896,
     author = {G.R. Baird and G. Thierrin},
     title = {On semigroups in which every {Rees} one-sided congruence is a congruence.},
     journal = {Semigroup forum},
     pages = {215--223},
     publisher = {mathdoc},
     volume = {4},
     year = {1972},
     zbl = {0265.20058},
     url = {http://geodesic.mathdoc.fr/item/SF_1972__4_133896/}
}