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From Manifold Atlas
J. W. Alexander, New topological invariants expressible as tensors., Nat. Acad. Proc. 10 (1924), 99-101. Zbl 50.0659.02
J. W. Alexander, New topological invariants expressible as tensors., Nat. Acad. Proc. 10 (1924), 99-101. Zbl 50.0659.02