@article{10_4171_ggd_73,
     author = {Alexey Belov and Roman Mikhailov},
     title = {Free subalgebras of {Lie} algebras close to nilpotent},
     journal = {Groups, geometry, and dynamics},
     pages = {15--29},
     year = {2010},
     volume = {4},
     number = {1},
     doi = {10.4171/ggd/73},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/73/}
}