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Canonical Coordinates and Natural Equations for Minimal Time-like Surfaces in $R^4_2$. (arXiv:1912.00014v1 [math.DG]) http://arxiv.org/abs/1912.00014
Canonical Coordinates and Natural Equations for Minimal Time-like Surfaces in $R^4_2$. (arXiv:1912.00014v1 [math.DG]) http://arxiv.org/abs/1912.00014