1. Dragan, Ya. & Yavorsky, I. (1980) Rhytmics of Sea Waving and Underwater Acoustic Signals, Kyiv: Naukova Dumka (in Russian).
2. Gardner, W. A. (1985). Introduction to Random Processes with Applicattions to Signals and Systems, New York: Macmillan.
3. Dragan, Ya., Yavorskyj, I. & Rozhkov, V. (1987). Methods of probabilistic analysis of oceanological rhytmics, Leningrad: Gidrometeoizdat (in Russian).
4. Gardner, W. A. (1994). Cyclostationarity in Communications and Signal Processing, New York: IEEE Press.
5. Hard, H. L. & Miamee, A. (2007). Periodically Correlated Random Sequences: Spectral Theory and Practice, New York: Wiley.