@article{10_4153_CMB_2003_030_5,
     author = {Tomaszewski, Witold},
     title = {A {Basis} of {Bachmuth} {Type} in the {Commutator} {Subgroup} of a {Free} {Group}},
     journal = {Canadian mathematical bulletin},
     pages = {299--303},
     year = {2003},
     volume = {46},
     number = {2},
     doi = {10.4153/CMB-2003-030-5},
     url = {http://geodesic.mathdoc.fr/articles/10.4153/CMB-2003-030-5/}
}