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3. and , Grundzüge der Tensorrechnunge in analytischer Darstellung, Part II, Springer, Wien, 1950, p. 184 ff.
4. Differential Geometry, Addison-Wesley Publ. Co., Reading, Pa., 1950.
5. Differential Geometry of Three Dimensions, Vol. 1, Cambridge Univ. Press, London, 1931.