MathSciNet bibliographic data MR404523 22E05 (81.35 35A30) Kalnins, E. G.; Miller, W., Jr. Lie theory and separation of variables. IX. Orthogonal $R$$R$-separable coordinate systems for the wave equation $\psi \sb{tt}-D\sb{2}\psi =0$$\psi \sb{tt}-D\sb{2}\psi =0$. J. Mathematical Phys. 17 (1976), no. 3, 331–355. Article

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