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Ayse Humeyra Bilge, Derya Celik b, Sahin Kocak, Arash M. Rezaeinazhad, “Gromov product structures, quadrangle structures and split metric decompositions for finite metric spaces”, Discrete Mathematics, 344(6) https://doi.org/10.1016/j.disc.2021.112358 (2021)
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Pierre-Emmanuel Caprace, Yves de Cornulier, Nicolas Monod, Romain Tessera, “Amenable hyperbolic groups”, arXiv, 2012 https://arxiv.org/abs/1202.3585
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