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@article{MS2_1971__28_166169, author = {Jens Peter Reus Christensen}, title = {Borel {Structures} in {Groups} and {Semigroups.}}, journal = {Mathematica Scandinavica}, pages = {124--128}, publisher = {mathdoc}, volume = {28}, year = {1971}, zbl = {0217.08502}, url = {http://geodesic.mathdoc.fr/item/MS2_1971__28_166169/} }
Jens Peter Reus Christensen. Borel Structures in Groups and Semigroups.. Mathematica Scandinavica, Tome 28 (1971), pp. 124-128. http://geodesic.mathdoc.fr/item/MS2_1971__28_166169/