We develop a WKB approximation technique to the Schr\"odinger equation with relativistic kinematics for central confining potentials. This approach gives simple formulas for the eigenvalues of the equation with a large class of potentials; numerical results are in good agreement with the results obtained with other methods even for small quantum numbers. Approximate expressions for the eigenfunctions are also obtained and the interpolation among different regions is discussed.
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Cea et al. (1982) studied this question.
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