1. Ya. Dragan, I. Javors’kyj, Rhythmics of Sea Waving and Underwater Acoustic Signals, Naukova dumka, Kijev, 1982 (in Russian).
2. Ya. Dragan, V. Rozhkov, I. Javors’kyj, Methods of Probabilistic Analysis of Oceanological Rhythmics, Gidrometeoizdat, Leningrad, 1987 (in Russian).
3. Cyclostationarity in Communications and Signal Processing;Gardner,1994
4. On periodically nonstationary random processes;Gudzenko;Radiotekh. Elektron,,1959
5. Time Sequence Analysis in Geophysics;Kanasewich,1981