MathSciNet bibliographic data MR333489 (48 #11814) 35Q99 (35J05) Coffman, Charles V. Uniqueness of the ground state solution for \$\Delta u-u+u\sp{3}=0\$$\Delta u-u+u\sp{3}=0$ and a variational characterization of other solutions. Arch. Rational Mech. Anal. 46 (1972), 81–95. Article

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