[1] N. BOBOC, Gh. BUCUR A. CORNEA: 
Order and Convexity in Potential Theory: H - Cones. Lecture Notes in Mathematics 853, Springer-Verlag, Berlin - Heidelberg - New York 1981. 
MR 0613980[2] J. LUKEŠ J. MALÝ L. ZAJÍČEK: 
Fine Topology Methods in Real Analysis and Potential Theory. Lecture Notes in Mathematics 1189, Springer-Verlag, Berlin - Heidelberg - New York - London - Paris - Tokyo 1986.    
MR 0861411