1. Min. Inostran. Del Ross. Fed., Bilateral treaties. Agreement between the Government of the Russian Federation and the Government of the Republic of Cuba on scientific, technical and innovative cooperation. https://www.mid.ru/foreign_policy/international_contracts/2_contract/-/storage-viewer/ bilateral/page-11/59096.
2. D. V. Bisikalo, I. S. Savanov, S. A. Naroenkov, M. A. Nalivkin, A. S. Shugarov, N. S. Bakhtigaraev, P. A. Levkina, M. A. Ibragimov, E. Yu. Kil’pio, M. E. Sachkov, A. P. Kartashova, A. M. Fateeva, M. R. Rodriguez Uratsuka, R. Z. Estrada, A. Alonso Diaz, et al., Astron. Rep. 62, 367 (2018).
3. Alonso Diaz, M. R. Rodriguez Uratsuka, O. Pons Rodriguez, Z. Barcenas Fonseca, et al., Rev. Cubana Fis. 37, 162 (2020).
4. D. Marshalov, O. Pons Rodriguez, Yu. Bondarenko, V. Suvorkin, I. Bezrukov, and S. Serzhanov, Rev. Cubana Fis. 37, 73 (2020).
5. Inst. Astron. Russ. Acad. Sci., Terskol Observatory and Zeiss-2000. http://www.inasan.ru/divisions/terskol/ckp/.