Derivations on the algebra of differential forms of higher order on a manifold Jaroslav Carbol, Jiří Vanžura (1982) Sborník prací Přírodovědecké fakulty University Palackého v Olomouci. Matematika
Differential invariants of conformal and projective surfaces. Hubert, Evelyne, Olver, Peter J. (2007) SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Differential invariants of the transformation group of a homogeneous space. Shirokov, I.V. (2007) Sibirskij Matematicheskij Zhurnal
Doubly projected tensor fields and connections in a second order semitangent bundle Т.А. Пантелеева (1986) Trudy Geometriceskogo Seminara