@article{10_1017_S0017089500003384,
     author = {Venkatesan, P. S.},
     title = {On right unipotent semigroups {II}},
     journal = {Glasgow mathematical journal},
     pages = {63--68},
     year = {1978},
     volume = {19},
     number = {1},
     doi = {10.1017/S0017089500003384},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089500003384/}
}