Доступные ссылки:

Harvard: Kurkina, O. E., Kurkin, A. A., Pelinovsky, E. N., Rouvinskaya, E. A.& Soomere, T. 2011. Higher-order (2 + 4) Korteweg-de Vries-like equation for interfacial waves in a symmetric three-layer fluid. Physics of Fluids, 231(11), doi: 10.1063/1.3657816