1. E.J. Cockayne, G. Fricke, S.T. Hedetniemi and C.M. Mynhardt, Properties of minimal dominating functions of graphs, Ars Combin., submitted.
2. E.J. Cockayne, G. McGillivray and C.M. Mynhardt, Convexity of minimal dominating functions of trees, submitted.
3. Upper domination on double cone graphs;Fricke;Congr. Numer.,1990
4. Bibliography on domination in graphs and some basic definitions of domination parameters;Hedetniemi;Discrete Math.,1990
5. Convex Sets;Valentine,1964