M. Chigidina, I. Lazarenko, D. Nomirovskii, B. Rublyov, V. Semenov, and K. Svitovenko, “Basic properties of the metric of tangents”, BTSNUKPhM, vol. 82, no. 1, pp. 265–272, Jun. 2026, doi: 10.17721/1812-5409.2026/1.34.