ArticlePartial Differential Equations of Mathematical Physics.Robert L. Borrelli·A. N. Tychonov·A. A. Samarski·S. B. Radding·1969·enABIABI:AkademIndex/openalex/2026.other.390842CiteAbstractNo abstract available.IdentifiersDOI10.2307/2316723Citations and referencesCited by 20 referencesMetrics — AkademScholar