Abstract
An alternative type of nonlinear evolution equation is derived that describes interfacial waves in a two-layer fluid system. The equation presented here is a higher-order version of the Benjamin-Ono (BO) equation. A solitary-wave solution of the equation is obtained by means of a singular perturbation method. The characteristics of the solution are discussed in comparison with those for a higher-order BO equation of the Lax type.
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