MathSciNet bibliographic data MR687637 (85e:35043) 35J60 (35J20) Coffman, Charles V. An alternate variational principle for $\Delta u-u+\mid u\mid \sp{r-1}{\rm sgn}\,u=0$$\Delta u-u+\mid u\mid \sp{r-1}{\rm sgn}\,u=0$. Proc. Amer. Math. Soc. 87 (1983), no. 4, 666–670. Article

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