@article{SF_1975__10_134117,
     author = {T. Tamura},
     title = {Basic study of ....-semigroups and their homomorphisms {II.}},
     journal = {Semigroup forum},
     pages = {250--261},
     publisher = {mathdoc},
     volume = {10},
     year = {1975},
     zbl = {0299.20052},
     url = {http://geodesic.mathdoc.fr/item/SF_1975__10_134117/}
}