The sum of two plane convex C... sets is not always C...
Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 216-224.

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Mots-clés : sum of convex bodies, differentiability properties of convex bodies
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     author = {Jan Boman},
     title = {The sum of two plane convex {C...} sets is not always {C...}},
     journal = {Mathematica Scandinavica},
     pages = {216--224},
     publisher = {mathdoc},
     volume = {66},
     number = {1},
     year = {1990},
     zbl = {0739.52003},
     url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167106/}
}
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Jan Boman. The sum of two plane convex C... sets is not always C.... Mathematica Scandinavica, Tome 66 (1990) no. 1, pp. 216-224. http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167106/