@article{10_4171_ggd_1,
     author = {Gilbert Baumslag and Charles F. Miller III},
     title = {The isomorphism problem for residually torsion-free nilpotent groups},
     journal = {Groups, geometry, and dynamics},
     pages = {1--20},
     year = {2007},
     volume = {1},
     number = {1},
     doi = {10.4171/ggd/1},
     url = {http://geodesic.mathdoc.fr/articles/10.4171/ggd/1/}
}