Orochko, Yu. B. Smooth approximation of selfadjoint differential operators of divergence form with bounded measurable coefficients. (English) Zbl 0459.47044 Math. USSR, Sb. 37, 389-401 (1980). MSC: 47F05 35R05 35J15 35A35 35P05 35J10 47A60 47B25 41A35 47A10 PDFBibTeX XMLCite \textit{Yu. B. Orochko}, Math. USSR, Sb. 37, 389--401 (1980; Zbl 0459.47044) Full Text: DOI
Orochko, Yu. B. Finite propagation velocity and essential self-adjointness of certain differential operators. (English. Russian original) Zbl 0435.47047 Funct. Anal. Appl. 13, 235-237 (1980); translation from Funkts. Anal. Prilozh. 13, No. 3, 95-96 (1979). MSC: 47F05 35R20 35J10 35L15 47B25 PDFBibTeX XMLCite \textit{Yu. B. Orochko}, Funct. Anal. Appl. 13, 235--237 (1980; Zbl 0435.47047); translation from Funkts. Anal. Prilozh. 13, No. 3, 95--96 (1979) Full Text: DOI