MathSciNet bibliographic data MR829052 (87f:35065) 35J15 (35J60 58G30) Kenig, Carlos E.; Ni, Wei-Ming On the elliptic equation $Lu-k+K\,{\rm exp}[2u]=0$$Lu-k+K\,{\rm exp}[2u]=0$. Ann. Scuola Norm. Sup. Pisa Cl. Sci. (4) 12 (1985), no. 2, 191–224. Article

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