@article{05827381,
title = {A tight lower bound for convexly independent subsets of the Minkowski sums of planar point sets.},
journal = {The Electronic Journal of Combinatorics [electronic only]},
volume = {17},
year = {2010},
zbl = {1205.52010},
language = {en},
url = {http://dml.mathdoc.fr/item/05827381}
}
Bílka, Ondřej; Buchin, Kevin; Fulek, Radoslav; Kiyomi, Masashi; Okamoto, Yoshio; Tanigawa, Shin-Ichi; Tóth, Csaba D. A tight lower bound for convexly independent subsets of the Minkowski sums of planar point sets.. The Electronic Journal of Combinatorics [electronic only], Tome 17 (2010) . http://gdmltest.u-ga.fr/item/05827381/