scientific article; zbMATH DE number 3431163
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Publication:5182592
zbMath0274.35034MaRDI QIDQ5182592
Publication date: 1973
Full work available at URL: http://www.numdam.org/item?id=SEDP_1972-1973____A28_0
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General topics in linear spectral theory for PDEs (35P05) General theory of partial differential operators (47F05)
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