@article{10_4153_CJM_1970_087_1,
     author = {Burroughs, John E. and Schafer, James A.},
     title = {Subgroups of {Conjugate} {Classes} in {Extensions}},
     journal = {Canadian journal of mathematics},
     pages = {773--783},
     year = {1970},
     volume = {22},
     number = {4},
     doi = {10.4153/CJM-1970-087-1},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1970-087-1/}
}