Geodesic
Generalized Schwarzian derivatives for generalized fractional linear transformations
Annales Polonici Mathematici, Tome 57 (1992) no. 1, pp. 29-44

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Generalizations of the classical Schwarzian derivative of complex analysis have been proposed by Osgood and Stowe [12, 13], Carne [5], and Ahlfors [3]. We present another generalization of the Schwarzian derivative over vector spaces. 
John Ryan. Generalized Schwarzian derivatives for generalized fractional linear transformations. Annales Polonici Mathematici, Tome 57 (1992) no. 1, pp. 29-44. doi: 10.4064/ap-57-1-29-44
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