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Fuglede, Bent Continuous domain dependence of the eigenvalues of the Dirichlet Laplacian and related operators in Hilbert space. (English) Zbl 0948.47047 J. Funct. Anal. 167, No. 1, 183-200 (1999). Reviewer: Hans-Dieter Alber (Darmstadt) MSC: 47F05 47A55 35J05 35P20 46E35 × Cite Format Result Cite Review PDF Full Text: DOI
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Rothe, E. H. Critical point theory in Hilbert space under general boundary conditions. (English) Zbl 0132.07902 J. Math. Anal. Appl. 11, 357-409 (1965). × Cite Format Result Cite Review PDF Full Text: DOI