Tangential Characteristic Symmetries and First Order Hyperbolic Systems. - Peter J. Vassiliou (Appl. Algebra Eng. Commun. Comput., 2001)

Efficient Construction of Contact Coordinates for PartialProlongations. - Peter J. Vassiliou (Found. Comput. Math., 2006)

Symmetry Reduction, Contact Geometry, and Partial Feedback Linearization. - José A. De Doná; Naghmana Tehseen; Peter J. Vassiliou (SIAM J. Control. Optim., 2018)