@article{10_4153_CJM_1979_099_1,
     author = {Putcha, Mohan S.},
     title = {Subgroups of the {Power} {Semigroup} of a {Finite} {Semigroup}},
     journal = {Canadian journal of mathematics},
     pages = {1077--1083},
     year = {1979},
     volume = {31},
     number = {5},
     doi = {10.4153/CJM-1979-099-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1979-099-1/}
}