Geodesic
The normal derivative lemma and surrounding issues
Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 77 (2022) no. 2, pp. 189-249

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In this survey we describe the history and current state of one of the key areas in the qualitative theory of elliptic partial differential equations related to the strong maximum principle and the boundary point principle (normal derivative lemma). Bibliography: 234 titles.
Keywords: strong maximum principle, normal derivative lemma, Hopf–Oleinik lemma, Harnack inequality, Aleksandrov–Bakelman maximum principle. 
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D. E. Apushkinskaya; A. I. Nazarov. The normal derivative lemma and surrounding issues. Trudy Matematicheskogo Instituta imeni V.A. Steklova, Tome 77 (2022) no. 2, pp. 189-249. http://geodesic.mathdoc.fr/item/RM_2022_77_2_a0/