scientific article; zbMATH DE number 3389575
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Publication:5658508
zbMath0246.35065MaRDI QIDQ5658508
Publication date: 1972
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Completeness of eigenfunctions and eigenfunction expansions in context of PDEs (35P10) Partial differential equations of mixed type and mixed-type systems of partial differential equations (35M99)
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