[1] O. Borůvka:
Linear Differential Transformations of the Second Order. The English Univ. Press, London 1971.
MR 0463539
[2] M. Čadek:
Form of general pointwise transformations of linear differential equations. Czechoslovak Math. J. 35 (110) (1985), 617-624.
MR 0809044
[3] F. Neuman:
Geometrical approach to linear differential equations of the $n$-th order. Rend. Math. 5 (1972), 579-602.
MR 0324141 |
Zbl 0257.34029
[4] F. Neuman: A note on smoothness of the Stäckel transformation. Prace Mat. WSP Krakow 11 (1985), 147-151.
[5] P. Stäckel: Über Transformationen von Differentialgleichungen. J. Reine Angew. Math. (Crelle Journal) 111 (1893), 290-302.
[6] J. Suchomel:
Preobrazovanie linejnych odnorodnych differencial'nych uravnenij vysshego porjadka. Arch. Math. (Brno) 13 (1977), 41-46.
MR 0499394