@article{10_4153_CJM_1974_048_5,
     author = {Berger, T. R.},
     title = {Hall {Higman} {Type} {Theorems,} {I}},
     journal = {Canadian journal of mathematics},
     pages = {513--531},
     year = {1974},
     volume = {26},
     number = {3},
     doi = {10.4153/CJM-1974-048-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1974-048-5/}
}