scientific article; zbMATH DE number 3355632
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Publication:5630093
zbMath0224.35068MaRDI QIDQ5630093
Publication date: 1971
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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