БЕЛКИН, Е. В.; КИРИЧОК, А. В.; КУКЛИН, В. М.; ПРИЙМАК, А. В. About S-theory verification which is used to describe the wave field modulation instabilities. Bulletin of V.N. Karazin Kharkiv National University, series «Mathematical modeling. Information technology. Automated control systems», v. 24, n. 1105, p. 5-20, 28 Apr. 2014.