$C$-distribution semigroups and $C$-ultradistribution semigroups in   locally convex spaces
  The main purpose of this paper is to investigate $C$-distribution semigroups and $C$-ultradistribution semigroups in the setting of sequentially complete locally convex spaces. There are a few important theoretical novelties in this field and there are given some interesting examples. 
Marko Kosti\' c, Stevan Pilipovi\' c and Daniel Velinov
math.FA