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@article{MS2_1990__66_1_167107, author = {Jan Boman}, title = {Smoothness of sums of convex sets with real analytic boundaries.}, journal = {Mathematica Scandinavica}, pages = {225--230}, publisher = {mathdoc}, volume = {66}, number = {1}, year = {1990}, zbl = {0738.52003}, url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167107/} }
Jan Boman. Smoothness of sums of convex sets with real analytic boundaries.. Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 225-230. http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167107/