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Hyperheavenly spaces theory in application to Walker and para-K\"ahler spaces. I. (arXiv:2107.09093v1 [math-ph]) http://arxiv.org/abs/2107.09093
Hyperheavenly spaces theory in application to Walker and para-K\"ahler spaces. I. (arXiv:2107.09093v1 [math-ph]) http://arxiv.org/abs/2107.09093