[1] Hildebrandt T. H.: 
Introduction to the Theory of Integration. Academic Press, New York, London, 1963. 
MR 0154957 | 
Zbl 0112.28302[2] Kurzweil J.: 
Generalized Ordinary Difterential Equations and Continuous Dependence on a Parameter. Czech. Math. J. 7 (82), (1957), 418-449. 
MR 0111875[3] Kurzweil J.: Generalized Ordinary Difterential Equations. Czech. Math. J. 8 (83), (1958), З60-З88.
[4] Schwabik Š.: On an Integral Opeгator in the Space of Functions with Bounded Variation. Čas. pëst. mat. 97 (1972), 297-ЗЗO.