[1] Kurzweil J.: Nichtabsolut konvergente Integrale. Teubner-Texte zur Mathematik 26, Teubner, Leipzig 1980. MR 0597703 | Zbl 0441.28001

[2] Kurzweil J.: The integral as a Hmit of integral sums. Jahrbuch Überblicke Mathematik 1984, 105-136, Bibliographisches Institut AG 1984.

[3] Schlesinger L.: Einführung in die Theorie der gewöhnlichen Differentialgleichungen auf funktionentheoretischer Grundlage. Berlin 1922.

[4] Gantmacher F. R.: Theory of Matrices. (Russian). Moskva 1966. English translation: Chelsea Publ. Co., New York 1959.

[5] Dollard J. D., Friedman С. N.: Product Integration with Applications to Differential Equations. University Press, Cambridge 1979. Zbl 0423.34014

[6] Saks S.: Theory of the Integral. Monografie matematyczne VII. G. E. Stechert, New York- Warszawa 1937.

[7] Kurzweil J., Jarník J.: Perron integral, Perron product integral and ordinary linear differential equations. In: Equadiff 6, Proceedings of the International Conference on Differential Equations and their Applications held in Brno, Czechoslovakia, Aug. 26-30, 1985, 149-154. Lecture Notes in Mathematics No. 1192. Springer-Verlag, Berlin-Heidelberg-New York-Tokyo 1986. MR 0877117