@article{SF_1970__1_133793,
     author = {F.T. jr. Christoph},
     title = {Embedding topological semigroups.},
     journal = {Semigroup forum},
     pages = {224--231},
     year = {1970},
     volume = {1},
     zbl = {0211.04206},
     url = {http://geodesic.mathdoc.fr/item/SF_1970__1_133793/}
}