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Müller-Pfeiffer, E. Über die Kneser-Konstante der Differentialgleichung (−δ)m u+q(x)u=0. Acta Mathematica Academiae Scientiarum Hungaricae 38, 139–150 (1981). https://doi.org/10.1007/BF01917529
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DOI: https://doi.org/10.1007/BF01917529