Ideals of the Lie algebras of vector fields Grabowski, Janusz (1993) Proceedings of the Winter School "Geometry and Topology"
Implicit quasilinear differential systems: A geometrical approach. Muñoz-Lecanda, Miguel C., Román-Roy, N. (1999) Electronic Journal of Differential Equations (EJDE) [electronic only]
Independent Rigid Secondary Classes for Holomorphic Foliations. Steven Hurder (1982) Inventiones mathematicae
Isomorphisms and Ideals of the Lie Algebras of Vector Fields. J. Grabowski (1978/1979) Inventiones mathematicae
Isomorphisms of Lie algebras of vector fields Marc De Wilde, Pierre B. A. Lecomte (1982) Commentationes Mathematicae Universitatis Carolinae