@article{AM2_1980__20_182399,
     author = {K.P. Chinda},
     title = {Some theorems on hemigroups.},
     journal = {Aequationes mathematicae},
     pages = {198--223},
     publisher = {mathdoc},
     volume = {20},
     year = {1980},
     zbl = {0439.22007},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__20_182399/}
}