@article{AM2_1980__21_182424,
     author = {K.P. Chinda and Jane M. Day},
     title = {The structure of hemigroups.},
     journal = {Aequationes mathematicae},
     pages = {129--141},
     year = {1980},
     volume = {21},
     zbl = {0459.22003},
     url = {http://geodesic.mathdoc.fr/item/AM2_1980__21_182424/}
}