113 citations to https://www.mathnet.ru/rus/sm3099
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Luiz Adauto Medeiros, “On a new class of nonlinear wave equations”, Journal of Mathematical Analysis and Applications, 69:1 (1979), 252
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Yoshio Yamada, “Note on certain nonlinear evolution equations of second order”, Proc. Japan Acad. Ser. A Math. Sci., 55:5 (1979)
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J.L. Lions, North-Holland Mathematics Studies, 30, Contemporary Developments in Continuum Mechanics and Partial Differential Equations, Proceedings of the International Symposium onContinuum Mechanics and Partial Differential Eyuations, 1978, 284