TY JOUR TI Orbifolds in one-dimensional Cayley-Klein spaces KW orbifolds KW discrete groups KW Cayley-Klein spaces JO Proceedings of the Komi Science Centre of the Ural Division of the Russian Academy of Sciences AU Kostyakov, I.V. AU Kuratov, V.V. PY 2025 IS 0 PB FSBI FIC "Komi Scientific Center of the Ural Branch of the Russian Academy of Sciences"