Plesha, M. I. (2001). Unimprovable Integral Estimate for Solutions of the Dirichlet Problem for Quasilinear Elliptic Equations of the Second Order in a Neighborhood of an Edge.
Ukrains’kyi Matematychnyi Zhurnal,
53(6), 860-865.
https://umj.imath.kiev.ua/index.php/umj/article/view/4307