A family of exactly solvable radial quantum systems on space of non-constant curvature with accidental degeneracy in the spectrum.
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Ragnisco, Orlando, Riglioni, Danilo (2010)
SIGMA. Symmetry, Integrability and Geometry: Methods and Applications [electronic only]
Marco Rigoli, Maura S., M. Vignati (1997)
Manuscripta mathematica
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