Abstract
Furry has given a formula for the normalization integral of a physically acceptable solution of the time-independent 1-dimensional Schrödinger equation corresponding to a bound state. Considering the wavefunction of a bound state in a single-well potential and using Furry's formula and the connection formulas discussed by N. Fröman, we derive the normalization factor for the higher-order phase-integral approximations introduced earlier by N. Fröman. For the special case of the first-order JWKB approximation, the approximate normalization factor thus obtained is equivalent to that given by Pauli and Furry.

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