@article{GDZPPN002350769,
title = {Borel Structures in Groups and Semigroups.},
journal = {Mathematica Scandinavica},
volume = {28},
year = {1971},
pages = {124-128},
zbl = {0217.08502},
url = {http://dml.mathdoc.fr/item/GDZPPN002350769}
}
Christensen, Jens Peter Reus. Borel Structures in Groups and Semigroups.. Mathematica Scandinavica, Tome 28 (1971) pp. 124-128. http://gdmltest.u-ga.fr/item/GDZPPN002350769/