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Kuchment, P. A. The absence of \(L_ 2-\)solutions for periodic partial differential equations. (English) Zbl 0461.35029 Russ. Math. Surv. 35, No. 2, 247-248 (1980). MSC: 35H10 35B10 35J10 PDFBibTeX XMLCite \textit{P. A. Kuchment}, Russ. Math. Surv. 35, No. 2, 247--248 (1980; Zbl 0461.35029) Full Text: DOI