References:
[1] |
Hopf, E., Elementare Bemerkungen über die Lösungen partieller Differentialgleichungen zweiter Ordnung vom elliptischen Typus. Berlin, Sber. Preuss. Akad. Wiss. 19, 147–152 (1927). · JFM 53.0454.02 |
[2] |
Protter, M. H., & H. F., Weinberger, Maximum Principles in Differential Equations. New Jersey: Prentice-Hall 1967. · Zbl 0153.13602 |
[3] |
Sokolnikoff, I. S., Mathematical Theory of Elasticity. New York: McGraw-Hill 1956. · Zbl 0070.41104 |
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