Parametrized curves in Lagrange Grassmannians

Igor Zelenko; Chengbo Li

Comptes Rendus. Mathématique, Volume 345 (2007) p. 647-652

A canonical frame for nonholonomic rank two distributions of maximal class

Boris Doubrov; Igor Zelenko

Comptes Rendus. Mathématique, Volume 342 (2006) p. 589-594