de Blasi, Francesco S., Lech Górniewicz, and Giulio Pianigiani. “Extension Theorems and Topological Essentiality in $\alpha$-Weakly Convex Metric Spaces”. Topological Methods in Nonlinear Analysis 36, no. 1 (September 1, 2009): 141–158. Accessed July 17, 2024. https://apcz.umk.pl/TMNA/article/view/TMNA.2009.034.