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Abraham, Ralph; Marsden, Jerrold E.; Ratiu, Tudor S. (February 1988) [First Edition 1983]. “Chapter 5 Tensors”. Manifolds, Tensor Analysis and Applications. Applied Mathematical Sciences, v. 75. 75 (2nd ed.). New York: Springer-Verlag. pp. 338–339. ISBN0-387-96790-7. OCLC18562688. "Elements of Trs are called tensors on E, [...]."