@article{BMMS_2012_35_2A_a11,
     author = {Alessandro Ottazzi},
     title = {Classes of {Nonrigid} {Carnot} {Groups}},
     journal = {Bulletin of the Malaysian Mathematical Society},
     year = {2012},
     volume = {35},
     number = {2A},
     url = {http://geodesic.mathdoc.fr/item/BMMS_2012_35_2A_a11/}
}