2 citations to https://www.mathnet.ru/rus/semr1189

1. Alexander Greshnov, Vladimir Potapov, “About coincidence points theorems on 2-step Carnot groups with 1-dimensional centre equipped with Box-quasimetrics”, MATH, 8:3 (2023), 6191  
2. A. V. Greshnov, “On finding the exact values of the constant in a $(1,q_2)$-generalized triangle inequality for Box-quasimetrics on $2$-step Carnot groups with $1$-dimensional center”, Сиб. электрон. матем. изв., 18:2 (2021), 1251–1260