@article{JDM_1976__78_146660,
     author = {Karl Heinrich Hofmann},
     title = {Topological {Semigroups.} {History,} {Theory,} {Applications.}},
     journal = {Jahresbericht der Deutschen Mathematiker-Vereinigung},
     pages = {9--60},
     year = {1976},
     volume = {78},
     zbl = {0361.22001},
     url = {http://geodesic.mathdoc.fr/item/JDM_1976__78_146660/}
}