@article{SF_1991__43_3_135115,
     author = {P.E.T. Jorgensen},
     title = {Semigroups of measures in non-commutative analysis.},
     journal = {Semigroup forum},
     pages = {263--290},
     publisher = {mathdoc},
     volume = {43},
     number = {3},
     year = {1991},
     zbl = {0734.43001},
     url = {http://geodesic.mathdoc.fr/item/SF_1991__43_3_135115/}
}