Submitted to the Bulletin of the Amer. The area of the unit sphere in three-dimensional normed spaces. Preprint posted in the Finsler Geom. A solution to a conjecture of Schaeffer. Preprint posted in the Finsler Geom.
Dual spheres have the same girth.
Submitted to the Journal of Diff. Tautness in invariant under Lie sphere transformations. Symplectic geometry and Hilbert's fourth problem. Work in progress Projective Lagrangian submanifolds and Hilbert's fourth problem, in collaboration with A. McRae. The differential and integral geometry of systems of curves, in collaboration with G. Berck.