Y. Kupryakov, K. Bychkov, O. Belova, A. Gorshkov, and M. Barta, “Evolution of solar flare SOL 2013-05-17: analysis of optical spectra (Balmer series) and quasiperiodic pulsations”, Acta Astrophys. Tau., vol. 6, no. 1, pp. 14–18, Mar. 2025.