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[1] M. Čadek: Form of general pointwise transformations of linear differential equations. Czech. Math. J. 35 (110), 1985, 617-624. MR 0809044
[2] M. Čadek: Pointwise transformations of linear differential systems. tо appeaг in Aгch. Math. (Bгnо), vоl. 26, 1990, nо. 4.
[3] W. N. Everitt J. D. Key: On some properties of matrices associated with linear ordinary quasi-differential expressions. preprint.
[4] W. N. Everitt Ғ. Neurnan: A concept of adjointness and symmetricity of differential expressions based on generalized Lagrange identity and Green's formula. Pгоceedings оf the 1982 Dundee Syrnpоsiurn оn Ordinary Differential Equatiоns, Lecture Nоtes in Math. 1032, Springeг 1983. MR 0742630
[5] P. Stäckel: Über Transformationen von Differentialgleichungen. Cгelles J. 111 (1893), 290-302.
[6] E. J. Wilczynski: Projective differential geometry of curves and ruled surfaces. Teubneг, Leipzig, 1906.
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