TY - JOUR AU - Alessandro Ottazzi TI - Classes of Nonrigid Carnot Groups JO - Bulletin of the Malaysian Mathematical Society PY - 2012 VL - 35 IS - 2A UR - http://geodesic.mathdoc.fr/item/BMMS_2012_35_2A_a11/ ID - BMMS_2012_35_2A_a11 ER -