Maximum convex hulls of connected systems of segments and of polyominoes. Bezdek, Károly, Braß, Peter, Harborth, Heiko (1994) Beiträge zur Algebra und Geometrie
Minimum-area axially symmetric convex bodies containing a triangle and its measure of axial symmetry. Lassak, Marek, Nowicka, Monika (2009) Beiträge zur Algebra und Geometrie