MathSciNet bibliographic data MR1368536 35J15 (35B45) Zhang, Qi A Harnack inequality for the equation $\nabla(a\nabla u)+b\nabla u=0$$\nabla(a\nabla u)+b\nabla u=0$, when $|b|\in K_{n+1}$$|b|\in K_{n+1}$. Manuscripta Math. 89 (1996), no. 1, 61–77. Article

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