Equation (14) of the paper by Aguilera-Navarro and Guardiola on the nonsingular spiked harmonic oscillator [J. Math. Phys. 32, 2135 (1991)] appears not to be applicable when α=2. By carrying out simple transformations on this equation it is shown that it can be evaluated in closed form in the limiting case α→2.
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Estévez-Bretón et al. (1993) studied this question.
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