Bílka, Ondřej, Kevin Buchin, Radoslav Fulek, Masashi Kiyomi, Yoshio Okamoto, Shin-ichi Tanigawa, and Csaba D. Tóth. “A Tight Lower Bound for Convexly Independent Subsets of the Minkowski Sums of Planar Point Sets”. The Electronic Journal of Combinatorics 17, no. 1 (October 29, 2010): N35. Accessed March 27, 2026. https://www.combinatorics.org/ojs/index.php/eljc/article/view/v17i1n35.