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Proper $r$-harmonic functions on the Thurston geometries. (arXiv:1910.13477v1 [math.DG]) http://arxiv.org/abs/1910.13477
Proper $r$-harmonic functions on the Thurston geometries. (arXiv:1910.13477v1 [math.DG]) http://arxiv.org/abs/1910.13477