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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ZblJan 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/
@article{MS2_1990__66_1_167106,
author = {Jan Boman},
title = {The sum of two plane convex {C...} sets is not always {C...}},
journal = {Mathematica Scandinavica},
pages = {216--224},
year = {1990},
volume = {66},
number = {1},
zbl = {0739.52003},
url = {http://geodesic.mathdoc.fr/item/MS2_1990__66_1_167106/}
}