@article{SF_1992__45_3_135180,
     author = {M. Kunze},
     title = {Bilateral  semidirect products of transformation   semigroups.},
     journal = {Semigroup forum},
     pages = {166--182},
     publisher = {mathdoc},
     volume = {45},
     number = {3},
     year = {1992},
     zbl = {0776.20020},
     url = {http://geodesic.mathdoc.fr/item/SF_1992__45_3_135180/}
}