Lingling Hou. (2022). A De Giorgi Type Result to Divergence Degenerate Elliptic Equation with Bounded Coefficients Related to Hörmander's Vector Fields.
            <i>Journal of Partial Differential Equations</i>. <i>36</i> (1).
            22-47.
         doi:10.4208/jpde.v36.n1.2