@article{10_4153_CJM_1972_054_1,
     author = {Hofer, Robert D.},
     title = {Restrictive {Semigroups} of {Continuous} {Functions} on {0-Dimensional} {Spaces}},
     journal = {Canadian journal of mathematics},
     pages = {598--611},
     year = {1972},
     volume = {24},
     number = {4},
     doi = {10.4153/CJM-1972-054-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1972-054-1/}
}