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Agmon: On eigenvalues, eigenfunctions, and resolvents of general elliptic problems. - A. De Vito: Calcolo degli autovalori e delle autosoluzioni per operatori non autoaggiunti. - L. De Vito: Sul calcolo per difetto e per eccesso degli autovalori delle trasformazioni compatte e delle relative molteplicità.
When you click on links to various merchants on this site and make a purchase, this can result in this site earning a commission. Affiliate programs and affiliations include, but are not limited to, the eBay Partner Network.