@article{GDZPPN001251139, title = {Split ...-coextensions of topological inverse semigroups.}, journal = {Semigroup forum}, volume = {12}, year = {1976}, pages = {45-62}, zbl = {0321.22003}, url = {http://dml.mathdoc.fr/item/GDZPPN001251139} }
Yeager, D. P. Split ...-coextensions of topological inverse semigroups.. Semigroup forum, Tome 12 (1976) pp. 45-62. http://gdmltest.u-ga.fr/item/GDZPPN001251139/