In this article, we introduce $s$-cluster sets of functions and multifunctions and investigate their various properties. Such investigations provide a new technique for studying $s$-closed spaces  and weakly Hausdorff spaces .
"A New Kind of Cluster Sets and Their Applications." Missouri J. Math. Sci. 21 (3) 198 - 205, October 2009. https://doi.org/10.35834/mjms/1316024885