Kurta , V. V. 1992. “On the Fragmen–Lindelof Theorems for Quasilinear Elliptic Equations of the Second Order ”.
Ukrains’kyi Matematychnyi Zhurnal
44 (10): 1376-81.
https://umj.imath.kiev.ua/index.php/umj/article/view/8234
.