@article{GDZPPN002360535, title = {Smoothness of sums of convex sets with real analytic boundaries.}, journal = {Mathematica Scandinavica}, volume = {67}, year = {1990}, pages = {225-230}, zbl = {0738.52003}, url = {http://dml.mathdoc.fr/item/GDZPPN002360535} }
Boman, Jan. Smoothness of sums of convex sets with real analytic boundaries.. Mathematica Scandinavica, Tome 67 (1990) pp. 225-230. http://gdmltest.u-ga.fr/item/GDZPPN002360535/