TY JOUR TI On possible external nature of circahoralian periods spectra KW circahoralian periods KW universal spectrum of periods KW fluctuations KW synchronization JO Russian Journal of Biological Physics and Chemisrty AU Panchelyuga, V.A. AU Panchelyuga, M.S. PY 2021 IS 6 PB Federal State Educational Institution of Higher Education Sevastopol State University