Geodesic
A generalization of the Schwarzian derivative and its applications
Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 229-238.

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A generalization of the Schwarzian derivative is proposed; this generalization is used to investigate functions having divided differences which are nonzero in a given region. A relation is established between this class of functions and linear homogeneous differential equations. 
@article{MZM_1971_10_2_a12,
     author = {B. E. Gopengauz},
     title = {A generalization of the {Schwarzian} derivative and its applications},
     journal = {Matemati\v{c}eskie zametki},
     pages = {229--238},
     publisher = {mathdoc},
     volume = {10},
     number = {2},
     year = {1971},
     language = {ru},
     url = {http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a12/}
}
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B. E. Gopengauz. A generalization of the Schwarzian derivative and its applications. Matematičeskie zametki, Tome 10 (1971) no. 2, pp. 229-238. http://geodesic.mathdoc.fr/item/MZM_1971_10_2_a12/