@article{SF_1989__39_2_134997,
     author = {T.M. Bisgaard},
     title = {On the continuity of convolution semigroups.},
     journal = {Semigroup forum},
     pages = {363--370},
     publisher = {mathdoc},
     volume = {39},
     number = {2},
     year = {1989},
     zbl = {0676.22002},
     url = {http://geodesic.mathdoc.fr/item/SF_1989__39_2_134997/}
}