[1] J. Jarnîk, J. Kurzweil: On Continuous Dependence on a Parameter. Contributions to the Theory of Non-Linear Oscilllations 5, 25-35. MR 0132232

[2] J. Jarník: On Some Assumptions of the Theorem on the Continuous Dependence on a Parameter. Čas. pro pӗst. mat. 86, 1961, 4, 404-414. MR 0139776

[3] J. Kurzweil Z. Vorel: O нeпpepывнoй зaвиcимocти peшeний диффepeндиaльныx ypaвнeний нa пapaмeтpe. Czech. Math. Јouгnal 7 (82), 1957, 4, 568-583. MR 0111874

[4] J. Kurzweil: Generalized Ordinary Differential Equations and Continuous Dependence on a Parameter. Czech. Math. Јournal 7(82), 1957, 3, 418-449. MR 0111875 | Zbl 0090.30002

[5] J. Kurzweil: Addition to My Paper „Generalized Ordinary Differential Equations and Continuous Dependence on a Parameter". Czech. Math. Јournal 9 (84), 1959, 564-573. MR 0111882

[6] J. Kurzweil: On Integration by Parts. Czech. Math. Јournal 8 (83), 1958, 356-359. MR 0111877 | Zbl 0094.03505