@article{SF_1976__13_134192,
     author = {D. Adu},
     title = {The partially ordered family of {C} {M-homomorphisms.}},
     journal = {Semigroup forum},
     pages = {1--18},
     year = {1976},
     volume = {13},
     zbl = {0345.20067},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__13_134192/}
}