Wave equations with energy-dependent potentials

@article{Formnek2004WaveEW,
  title={Wave equations with energy-dependent potentials},
  author={Jiř{\'i} Form{\'a}nek and R J Lombard and Jir{\'i} J. Mares},
  journal={Czechoslovak Journal of Physics},
  year={2004},
  volume={54},
  pages={289-315}
}
We study wave equations with energy-dependent potentials. Simple analytical models are found useful to illustrate difficulties encountered with the calculation and interpretation of observables. A formal analysis shows under which conditions such equations can be handled as evolution equation of quantum theory with an energy-dependent potential. Once these conditions are met, such theory can be transformed into ordinary quantum theory. 
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