MathSciNet bibliographic data MR677622 35Q20 (58F07) Li, Yi Shen Evolution equations associated with the eigenvalue problem based on the equation $\varphi \sb{xx}=[u(x)-k\sp{2}\rho \sp{2}(x)]\,\varphi$$\varphi \sb{xx}=[u(x)-k\sp{2}\rho \sp{2}(x)]\,\varphi$. Nuovo Cimento B (11) 70 (1982), no. 1, 1–12. Article

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