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Energetic estimates analogous to the Saint-Venant principle and their applications. (English) Zbl 0404.35014
Equadiff IV, Proc., Prague 1977, Lect. Notes Math. 703, 328-339 (1979).

35B45 A priori estimates in context of PDEs
35J05 Laplace operator, Helmholtz equation (reduced wave equation), Poisson equation
74G50 Saint-Venant’s principle
35J30 Higher-order elliptic equations