@article{MAN_1970__188_162047,
     author = {J. KIST and S. LEESTMA},
     title = {A {Class} of {Topological} {Semigroups.}},
     journal = {Mathematische Annalen},
     pages = {206--213},
     publisher = {mathdoc},
     volume = {188},
     year = {1970},
     zbl = {0188.05801},
     url = {http://geodesic.mathdoc.fr/item/MAN_1970__188_162047/}
}