BENEVIERI, Pierluigi, CALAMAI, Alessandro and FURI, Massimo. On the degree for oriented quasi-Fredholm maps: its uniqueness and its effective extension of the Leray-Schauder degree. Topological Methods in Nonlinear Analysis. Online. 1 September 2015. Vol. 46, no. 1, pp. 401 - 430. [Accessed 3 July 2024]. DOI 10.12775/TMNA.2015.052.