DING, Zouhua and KARTSATOS, Athanassios G. $p$-regular mappings and alternative results for perturbations of $m$-accretive operators in Banach spaces. Topological Methods in Nonlinear Analysis. Online. 1 June 1995. Vol. 5, no. 2, pp. 291 - 304. [Accessed 22 July 2024].