MathSciNet bibliographic data MR404524 (53 #8325b) 22E05 (81.35 35A30) Kalnins, E. G.; Miller, W., Jr. Lie theory and separation of variables. X. Nonorthogonal $R$$R$-separable solutions of the wave equation $\partial\sb{tt}\psi =D\sb{2}\psi$$\partial\sb{tt}\psi =D\sb{2}\psi$. J. Mathematical Phys. 17 (1976), no. 3, 356–368. Article

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