Repovš, D., & Semenov, P. V. (1996). A selection theorem for mappings with nonconvex nondecomposable values in $L_p$-spaces. Topological Methods in Nonlinear Analysis, 8(2), 407–412. Pobrano z https://apcz.umk.pl/TMNA/article/view/TMNA.1996.042