@article{SF_1996__53_2_135494,
     author = {T.M. Bisgaard},
     title = {Separation by characters or positive definite functions.},
     journal = {Semigroup forum},
     pages = {317--320},
     publisher = {mathdoc},
     volume = {53},
     number = {2},
     year = {1996},
     zbl = {0867.43002},
     url = {http://geodesic.mathdoc.fr/item/SF_1996__53_2_135494/}
}