1. Abramov-Maximov, V.E., Efremov, V.I., Parfinenko, L.D., Solov’ev, A.A., and Shibasaki, K., Long-term oscillations of sunspots from simultaneous observations with the Nobeyama Radioheliograph and Solar Dynamics Observatory, Publ. Astron. Soc. Jpn., 2013, vol.65, no. SP1, id S12.
2. Astaf’eva, N.M., Wavelet analysis: Basic theory and some applications, Phys.-Usp., 1996, vol. 39, no. 11, pp. 1085–1108.
3. Balthasar, H., Knoelker, M., Wiehr, E., and Stellmacher, G., Evidence for quasi-periodic Doppler motions in solar prominences, Astron. Astrophys., 1986, vol. 163, nos. 1–2, pp. 343–346.
4. Balthasar, H., Wiehr, E., and Stellmacher, G., Periodic and quasiperiodic Doppler velocity variations in solar prominences along one spatial direction, Astron. Astrophys., 1988, vol. 204, nos. 1–2, pp. 286–300.
5. Bashkirtsev, V.S. and Mashnich, G.P., Oscillatory processes in prominences, Sol. Phys., 1984, vol. 91, pp. 93–101.