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@article{MS2_1987__60_167020, author = {Christer O. Kiselman}, title = {Smoothness of vector sums of plane convex sets.}, journal = {Mathematica Scandinavica}, pages = {239--252}, publisher = {mathdoc}, volume = {60}, year = {1987}, zbl = {0617.52004}, url = {http://geodesic.mathdoc.fr/item/MS2_1987__60_167020/} }
Christer O. Kiselman. Smoothness of vector sums of plane convex sets.. Mathematica Scandinavica, Tome 60 (1987), pp. 239-252. http://geodesic.mathdoc.fr/item/MS2_1987__60_167020/