The work of I.A. and A.H. was performed at the Steklov International Mathematical Center and supported by the Ministry of Science and Higher Education of the Russian Federation (Agreement No.075-15-2022-265. The work of K.R. was performed
within the scientific project No. FSSF-2023-0003. K.R. and P.S. thank the “BASIS” Science Foundation (Grant No. 22-1-3-18-1 and No. 21-1-5-127-1, No. 23-1-4-43-1).
Поступила в редакцию: 14.07.2023 Принята в печать: 29.11.2023