scientific article; zbMATH DE number 3342345
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Publication:5618646
zbMath0215.45902MaRDI QIDQ5618646
Publication date: 1969
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
PDEs in connection with optics and electromagnetic theory (35Q60) Estimates of eigenvalues in context of PDEs (35P15)
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