@article{SF_1983__27_134634,
     author = {P.R. Jones},
     title = {The least inverse and orthodox congruences on a completely regular semigroup.},
     journal = {Semigroup forum},
     pages = {390--392},
     publisher = {mathdoc},
     volume = {27},
     year = {1983},
     zbl = {0537.20036},
     url = {http://geodesic.mathdoc.fr/item/SF_1983__27_134634/}
}