2 citations to https://www.mathnet.ru/rus/mzm10985

1. Ch. P. Chalk, M. Edjvet, “Curvature distribution and hyperbolicity”, Journal of Group Theory, 26:4 (2023), 645–663    
2. D. Holt, S. Linton, M. Neunhoeffer, R. Parker, M. Pfeiffer, C. M. Roney-Dougal, “Polynomial-time proofs that groups are hyperbolic”, J. Symb. Comput., 104 (2021), 419–475