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Caffarelli, L.A. and Peral, I. (1998) On Estimates for Elliptic Equations in Divergence Form. Communications on Pure and Applied Mathematics, 51, 1-21.
https://doi.org/10.1002/(sici)1097-0312(199801)51:1<1::aid-cpa1>3.0.co;2-g

has been cited by the following article:

• TITLE: Besov Estimates for Sub-Elliptic Equations in the Heisenberg Group

  AUTHORS: Huimin Cheng, Feng Zhou

  KEYWORDS: Heisenberg Group, Sub-Elliptic Equations, Regularity, Besov Spaces

  JOURNAL NAME: Advances in Pure Mathematics, Vol.14 No.9, September 13, 2024

  ABSTRACT: In this article, we deal with weak solutions to non-degenerate sub-elliptic equations in the Heisenberg group, and study the regularities of solutions. We establish horizontal Calderón-Zygmund type estimate in Besov spaces with more general assumptions on coefficients for both homogeneous equations and non-homogeneous equations. This study of regularity estimates expands the Calderón-Zygmund theory in the Heisenberg group.