@article{10_4171_ggd_90,
     author = {Matthew G. Brin},
     title = {The free group of rank 2 is a limit of {Thompson{\textquoteright}s} group $F$},
     journal = {Groups, geometry, and dynamics},
     pages = {433--454},
     year = {2010},
     volume = {4},
     number = {3},
     doi = {10.4171/ggd/90},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/90/}
}