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Ottazzi, Alessandro; Warhurst, Ben (2011). Algebraic prolongation and rigidity of Carnot groups. Monatshefte für Mathematik, 162(2), pp. 179-195. Wien: Springer-Verlag Wien 10.1007/s00605-009-0170-7
Ottazzi, Alessandro (2008). A sufficient condition for nonrigidity of Carnot groups. Mathematische Zeitschrift, 259(3), pp. 617-629. Springer 10.1007/s00209-007-0240-2
