@article{SF_1976__12_134156,
     author = {D. P. Yeager},
     title = {Split ...-coextensions of topological inverse semigroups.},
     journal = {Semigroup forum},
     pages = {45--62},
     year = {1976},
     volume = {12},
     zbl = {0321.22003},
     url = {http://geodesic.mathdoc.fr/item/SF_1976__12_134156/}
}