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    • Shape invariance through Crum transformation 

      Organista, José Orlando; Nowakowski, Marek; Rosu Barbus, Haret-Codratian (2006)
      "We show in a rigorous way that Crum´s result regarding the equal eigenvalue spectrum of Sturm-Liouville problems can be obtained iteratively by successive Darboux transformations. Furthermore, it can be shown that all ...