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Ha Huy Bang, A Property of Infinitely Differentiable Functions, Proceedings of the American Mathematical Society, Vol. 108, No. 1 (Jan., 1990), pp. 73-76 ...
Ulrich Menne, Weakly Differentiable Functions on Varifolds, Indiana University Mathematics Journal, Vol. 65, No. 3 (2016), pp. 977-1088 ...