1. H. Dekker, S. D’Odorico, A. Kaufer, et al., SPIE Conf. Proc. 4008, 534 (2000).
2. P. E. Doherty, P. Antilogus, P. Astier, et al., SPIE Conf. Proc. 9154, id. 915418 (2014).
3. M. Downing, D. Baade, P. Sinclaire, et al., SPIE Conf. Proc. 6276, id. 627609 (2006).
4. G. G. Valyavin, V. D. Bychkov, M. V. Yushkin, et al., Astrophysical Bulletin 69 (2), 224 (2014).
5. G. G. Valyavin, F. A. Musaev, A. V. Perkov, et al., Astrophysical Bulletin 75 (2), 191 (2020).