@article{JLT_2015_25_3_JLT_2015_25_3_a3,
     author = {M. R. Hughes and M. D. Staic and X. Xie},
     title = {Classification of a {Class} of {Nonrigid} {Carnot} {Groups}},
     journal = {Journal of Lie theory},
     pages = {717--732},
     year = {2015},
     volume = {25},
     number = {3},
     url = {http://geodesic.mathdoc.fr/item/JLT_2015_25_3_JLT_2015_25_3_a3/}
}