Applied Mathematics Letters · 2020 · 19 citations · 19 references
Natural SciencesMathematicsPhysicsDifferential EquationsBoundary-value ProblemsDifference EquationsInitial Value ProblemsPartial Differential EquationsSystems Of Differential Equations
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Linear spectral problems, non-linear equations and the δ-method
Richard Beals, Ronald R. Coifman · Inverse Problems · 1989 · 178 citations