@article{GDZPPN001251236, title = {Multiplication semigroups II.}, journal = {Semigroup forum}, volume = {12}, year = {1976}, pages = {145-164}, zbl = {0343.20031}, url = {http://dml.mathdoc.fr/item/GDZPPN001251236} }
Mannepalli, V. L. Multiplication semigroups II.. Semigroup forum, Tome 12 (1976) pp. 145-164. http://gdmltest.u-ga.fr/item/GDZPPN001251236/