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An explicit nonlinear transformation relating solutions of the Korteweg-de Vries equation and a similar nonlinear equation is presented. This transformation is generalized to solutions of a one-parameter family of similar nonlinear equations. A transformation is given which relates solutions of a ``forced'' Korteweg-de Vries equation to those of the Korteweg-de Vries equation.
Robert M. Miura (1968) studied this question.