@article{SF_1992__44_1_135140,
     author = {M.K. Sen},
     title = {p-congruences on p-regular semigroups.},
     journal = {Semigroup forum},
     pages = {149--156},
     year = {1992},
     volume = {44},
     number = {1},
     zbl = {0747.20031},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__44_1_135140/}
}