Abstract
It is shown that a subtle variation of the Zwaan-Stueckelberg technique, based on semi-classical JWKB phase integrals and their analytic continuation in the complex plane yields the result of Berry and Ozorio de Almeida (see J. Phys. A: Math., Nucl. Gen., vol.6, p.1451 of 1973) concerning the semi-classical phase-shift and energy eigenvalue appropriate to the radial equation for two-dimensional potentials in the case of s waves.

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