Morozov, Oleg I.; Chang, Jen-Hsu The dispersionless Veselov-Novikov equation: symmetries, exact solutions, and conservation laws. (English) Zbl 1472.35020 Anal. Math. Phys. 11, No. 3, Paper No. 126, 26 p. (2021). MSC: 35B06 34C05 35G20 35Q60 17B50 22E70 PDFBibTeX XMLCite \textit{O. I. Morozov} and \textit{J.-H. Chang}, Anal. Math. Phys. 11, No. 3, Paper No. 126, 26 p. (2021; Zbl 1472.35020) Full Text: DOI
Barkovsky, L. M.; Furs, A. N. Maxwell’s square roots from the metric tensors of wave surfaces and branches of solutions of the photon and phonon wave equations. (English) Zbl 0924.35159 J. Phys. A, Math. Gen. 30, No. 13, 4665-4675 (1997). MSC: 35Q60 22E70 78A10 81V70 81V80 PDFBibTeX XMLCite \textit{L. M. Barkovsky} and \textit{A. N. Furs}, J. Phys. A, Math. Gen. 30, No. 13, 4665--4675 (1997; Zbl 0924.35159) Full Text: DOI