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We start with a Riemann-Hilbert Problems (RHP) with canonical normalizationwhose sewing functions depends on several additional variables. UsingZakharov-Shabat theorem we are able to construct a family of ordinarydifferential operators for which the solution of the RHP is a commonfundamental analytic solution. This family of operators obviously commute. Thuswe are able to construct new classes of integrable nonlinear evolutionequations.

Riemann-Hilbert Problems with canonical normalization and families of commuting operators