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Konashenko, A.V. A criterion for the bessel property of systems of the form exp(iλn t)sin(Μn t) and exp(iλn t)cos(λn t). Diff Equat 36, 807–812 (2000). https://doi.org/10.1007/BF02754403
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DOI: https://doi.org/10.1007/BF02754403