Sharp forms of estimates for subsolutions and supersolutions of quasilinear elliptic equations involving measures
Gary M. Lieberman · Communications in Partial Differential Equations · 1993
(1993). Sharp forms of estimates for subsolutions and supersolutions of quasilinear elliptic equations involving measures. Communications in Partial Differential Equations: Vol. 18, No. 7-8, pp. 1191-1212.