@article{SF_1981__23_134525,
     author = {T. Imaoka},
     title = {*-Congruences on regular *-semigroups.},
     journal = {Semigroup forum},
     pages = {321--326},
     publisher = {mathdoc},
     volume = {23},
     year = {1981},
     zbl = {0482.20040},
     url = {http://geodesic.mathdoc.fr/item/SF_1981__23_134525/}
}