Geodesic
On the Geometry of Point-Transformation Invariant Class of Third-Order Ordinary Differential Equations
Matematičeskie zametki, Tome 77 (2005) no. 5, pp. 719-726.

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Applying geometric methods, we study a class of third-order ordinary differential equations closed with respect to point transformations. We associate with such an equation the pseudovector fields formed by its coefficients. The equation possesses a maximal algebra of point-transformation symmetries if five pseudovector fields vanish. 
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V. V. Kartak. On the Geometry of Point-Transformation Invariant Class of Third-Order Ordinary Differential Equations. Matematičeskie zametki, Tome 77 (2005) no. 5, pp. 719-726. http://geodesic.mathdoc.fr/item/MZM_2005_77_5_a5/

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