@article{GDZPPN001251538,
title = {Semilattices of proper inverse semigroups.},
journal = {Semigroup forum},
volume = {12},
year = {1976},
pages = {29-36},
zbl = {0337.20027},
url = {http://dml.mathdoc.fr/item/GDZPPN001251538}
}
Hardy, D.W.; Tirasupa, Y. Semilattices of proper inverse semigroups.. Semigroup forum, Tome 12 (1976) pp. 29-36. http://gdmltest.u-ga.fr/item/GDZPPN001251538/