@article{GDZPPN001258532, title = {Solvability in inverse semigroups.}, journal = {Semigroup forum}, volume = {33}, year = {1986}, pages = {287-304}, zbl = {0604.20058}, url = {http://dml.mathdoc.fr/item/GDZPPN001258532} }
Piochi, B. Solvability in inverse semigroups.. Semigroup forum, Tome 33 (1986) pp. 287-304. http://gdmltest.u-ga.fr/item/GDZPPN001258532/