MathSciNet bibliographic data MR38535 36.0X Olevskiĭ, M. N. Triorthogonal systems in spaces of constant curvature in which the equation $\Delta\sb 2u+\lambda u=0$$\Delta\sb 2u+\lambda u=0$ allows a complete separation of variables. (Russian) Mat. Sbornik N.S. 27(69), (1950). 379–426. Links to the journal or article are not yet available

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