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A decomposition by non-negative functions in the Sobolev space $W^{k, 1}$. (arXiv:1807.05221v1 [math.FA]) http://arxiv.org/abs/1807.05221
A decomposition by non-negative functions in the Sobolev space $W^{k, 1}$. (arXiv:1807.05221v1 [math.FA]) http://arxiv.org/abs/1807.05221