1. Christensen, J.P.R.,Borel structures in groups and semigroups, Math. Scand. 28 (1971), 124–128.
2. Csiszár, I.,Some problems concerning measures on topological spaces and convolutions of measures on topological groups, Actes de Colloque International sur les Probabilités sur les Structures Algébriques 186 (1969), 75–96.
3. Gelbaum, B.R. and G.K. Kalisch,Measure in semigroups, Canadian J. Math. 4 (1952), 396–406.
4. Grenander, U.,Probabilities on Algebraic Structures, Almquist & Wiksell, Stockholm, 1968.
5. de Groote, H.F.,Trägertopologien auf meßbaren Räumen, Math. Z. 138 (1974), 21–34.