• Self-adjoint oscillator operator from a modified factorization 

      Reyes, Marco A.; Rosu Barbus, Haret-Codratian; Gutiérrez, M. Ranferí (2011)
      "By using an alternative factorization, we obtain a self-adjoint oscillator operator of the form Lδ=ddx(pδ(x)ddx)−(x2pδ(x)+pδ(x)−1), where pδ(x)=1+δe−x2, with δ∈(−1,∞) an arbitrary real factorization parameter. At positive ...