@article{10_4153_CJM_1993_063_5,
     author = {Bryant, Roger M. and Drensky, Vesselin},
     title = {Dense {Subgroups} of the {Automorphism} {Groups} of {Free} {Algebras}},
     journal = {Canadian journal of mathematics},
     pages = {1135--1154},
     year = {1993},
     volume = {45},
     number = {6},
     doi = {10.4153/CJM-1993-063-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CJM-1993-063-5/}
}