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Publication:3209472
zbMath0722.34069MaRDI QIDQ3209472
Publication date: 1990
Title: zbMATH Open Web Interface contents unavailable due to conflicting licenses.
Antennas, waveguides in optics and electromagnetic theory (78A50) Linear boundary value problems for ordinary differential equations (34B05) Eigenvalues, estimation of eigenvalues, upper and lower bounds of ordinary differential operators (34L15)
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