C ∞ -symmetries and reduction of equations without Lie point symmetries. Muriel, C., Romero, J. L. (2003) Journal of Lie Theory
Conformal structures associated to generic rank 2 distributions on 5-manifolds -- characterization and Killing-field decomposition. Hammerl, Matthias, Sagerschnig, Katja (2009) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Connecting fast-slow systems and Conley index theory via transversality. Kuehn, Christian (2010) Electronic Journal of Differential Equations (EJDE) [electronic only]
Contact Lie algebras of vector fields on the plane. Doubrov, Boris M., Komrakov, Boris P. (1999) Geometry & Topology