Flat tensor product surfaces of pseudo-Euclidean curves Adela Mihai, Bogdan Heroiu (2014) Annales Polonici Mathematici We determine the flat tensor product surfaces of two curves in pseudo-Euclidean spaces of arbitrary dimensions.
Flow under curvature: Singularity formation, minimal surfaces, and geodesics. Chopp, David L., Sethian, James A. (1993) Experimental Mathematics