ReferencesV. Kozlov, N. G. Kuznetsov“A comparison theorem for super- and subsolutions of $\nabla^2u+f(u)=0$ and its application to water waves with vorticity”, Algebra i Analiz, 2018, Volume 30, Issue 3,Pages 112

A comparison theorem for super- and subsolutions of $\nabla^2u+f(u)=0$ and its application to water waves with vorticity
V. Kozlov, N. G. Kuznetsov



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