MathSciNet bibliographic data MR1916056 81Q10 (34L40 47E05) Falomir, H.; Pisani, P. A. G.; Wipf, A. Pole structure of the Hamiltonian $\zeta$$\zeta$-function for a singular potential. J. Phys. A 35 (2002), no. 26, 5427–5444. Article

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