We show that some sum rules for the hydrogen atom derived recently are incorrect because the authors did not take into account the continuous part of the spectrum in the sum over intermediate states.
A new class of sum rules for products of Bessel functions
Comment on "Nonperturbative Calculation of Born-Infeld Effects on the Schrodinger Spectrum of the Hydrogen Atom" [Phys. Rev. Lett. 96 (2006) 030402, arXiv:math-ph/0506069]
Hydrogen atom in de Sitter spaces and Heun functions
![QR code for arXiv:1102.4114 [math-ph]](http://oss.arxitics.com/images/favicon.svg)