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[1] J. Aczél: Lectures on functional equations and their applications. Acad. Press, New York, 1966. MR 0208210
[2] M. Čadek: Pointwise transformations of linear differential equations. PhD-thesis, in Czech, Brno 1986.
[3] C. Chevalley: Theory of Lie groups I. Princeton Univ. Press, 1946. MR 0082628 | Zbl 0063.00842
[4] J. Dieudonné: La géométrie des groupes classiques. 3rd edition, Springer-Verlag 1971. MR 0310083
[5] E. J. Wilczynski: Projective differential geometry of curves and ruled surfaces. B. G. Teubner, Leipzig, 1906.
[6] A. Zajtz: Personal communication. Zbl 0961.37005
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