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Translated from Ukrainskii Matematicheskii Zhurnal, Vol. 40, No. 4, pp. 411–416, July–August, 1988.
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Barannik, L.F., Lagno, V.I. & Fushchich, V.I. Subalgebras of the poincaré algebra AP(2, 3) and the symmetric reduction of the nonlinear ultrahyperbolic d'Alembert equation. I. Ukr Math J 40, 351–356 (1988). https://doi.org/10.1007/BF01057195
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DOI: https://doi.org/10.1007/BF01057195