On a problem about covering lines by squares.
On faces of a convex polyhedron in with a small number of sides.
On four-colourings of the rational four-space.
On the Complexity of Polyhedral Separability.
On the Exact Constant in the Quantitative Steinitz Theorem in the Plane.
On the General Motion-Planning Problem with Two Degrees of Freedom.
On the Number of Critical Free Contacts of a Convex Polygonal Object Moving in Two-Dimensional Polygonal Space.
On the Number of Guard Edges of a Polygon.