scientific article; zbMATH DE number 3560040
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Publication:4132894
zbMath0359.35021MaRDI QIDQ4132894
Publication date: 1977
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Spectral theory and eigenvalue problems for partial differential equations (35P99) Linear symmetric and selfadjoint operators (unbounded) (47B25) Higher-order elliptic equations (35J30)
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