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Originalpublikation
Hefter, E.F.: The Extended Korteweg-de Vries Equation. In: Zeitschrift für Naturforschung A 37 (1982), S. 1119-1123. DOI: https://doi.org/10.1515/zna-1982-1002
A slight and natural extension of the traditional Korteweg-de Vries equation (KdV) allows all (or groups) of its solitons to have the same velocity thus facilitating the application of the KdV to realistic quantum mechanical problems.