Coronas and domination subdivision number of a graph
  In this paper, for a graph G and a family of partitions P of vertex neighborhoods of G, we define the general corona G \circ P of G. Among several properties of this new operation, we focus on application general coronas to a new kind of characterization of trees with the domination subdivision number equal to 3. 
Magda Dettlaff and Magdalena Lema\'nska and Jerzy Topp and Pawe{\l}   \.Zyli\'nski
math.CO