Frigon, M. and Lee, J. W. (1993) “Existence principles for Carathéodory differential equations in Banach spaces”, Topological Methods in Nonlinear Analysis, 1(1), pp. 95–111. Available at: https://apcz.umk.pl/TMNA/article/view/TMNA.1993.009 (Accessed: 20 April 2024).