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At the time of writing with the Department of Applied Analysis and Computer Science, Faculty of Mathematics, University of Waterloo, Waterloo, Ontario, Canada.
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Lovelock, D. Divergence-free tensorial concomitants. Aeq. Math. 4, 127–138 (1970). https://doi.org/10.1007/BF01817753
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DOI: https://doi.org/10.1007/BF01817753