MathSciNet bibliographic data MR473472 (57 #13138) 35C99 Boyer, C. P.; Kalnins, E. G.; Miller, W., Jr. Symmetry and separation of variables for the Hamilton-Jacobi equation \$W\sp{2}\sb{t}-W\sp{2}\sb{x}-W\sp{2}\sb{y}=0\$$W\sp{2}\sb{t}-W\sp{2}\sb{x}-W\sp{2}\sb{y}=0$. J. Mathematical Phys. 19 (1978), no. 1, 200–211. Article

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