Bálint, Csaba, Gábor Valasek, and Lajos Gergó. “Operations on Signed Distance Functions”. Acta Cybernetica 24, no. 1 (May 21, 2019): 17-28. Accessed November 15, 2019. http://cyber.bibl.u-szeged.hu/index.php/actcybern/article/view/4004.