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2. Pseudo-minkowski differential geometry
3. The analytic geometry of the unsymmetric MINKOWSKI plane, Univ. of Minnesota, School of Mathematics, Minneapolis 1967 (mimeographed notes)
4. Geometry of thermodynamics, Proc. XV Intern. Conf. on Diff. Geom. Methods in Theor. Phys. Clausthal 1986 (ed. by ), World Scientific, Singapore 1987, 455–464