@article{10_1017_S0017089599000373,
     author = {Ku\v{r}il, Martin and Szendrei, M\'aria B.},
     title = {Extensions by inverse semigroups and\ensuremath{\lambda}-semidirect products},
     journal = {Glasgow mathematical journal},
     pages = {355--367},
     year = {1999},
     volume = {41},
     number = {3},
     doi = {10.1017/S0017089599000373},
     url = {http://geodesic.mathdoc.fr/articles/10.1017/S0017089599000373/}
}