We prove a Harnack’s inequality for non-negative solutions of some degenerate elliptic operators in divergence form with the lower order term coefficients satisfying a Kato type condition.
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Ahmed Mohammed, Harnack’s inequality for solutions of some degenerate elliptic equations. Rev. Mat. Iberoam. 18 (2002), no. 2, pp. 325–354DOI 10.4171/RMI/321