Birkhoff, G. D. The generalized Riemann problem for linear differential equations and the allied problems for linear difference and \(q\)-difference equations. (English) JFM 44.0391.03 Bull. Am. Math. Soc. (2) 19, 508-509 (1913); Proc. Am. Acad. 49, 521-568 (1913). Reviewer: Wallenberg, Prof. (Berlin) MSC: 34A30 39A06 39A13 PDF BibTeX XML Cite \textit{G. D. Birkhoff}, Bull. Am. Math. Soc. 19, 508--509 (1913; JFM 44.0391.03) OpenURL
Birkhoff, G. D. On a simple type of irregular singular point. (English) JFM 44.0373.02 Trans. Am. Math. Soc. 14, 462-476 (1913). Reviewer: Wallenberg, Prof. (Berlin) MSC: 34C05 PDF BibTeX XML Cite \textit{G. D. Birkhoff}, Trans. Am. Math. Soc. 14, 462--476 (1913; JFM 44.0373.02) Full Text: DOI OpenURL
Birkhoff, G. D. Equivalent singular points of ordinary linear differential equations. (English) JFM 44.0373.01 Math. Ann. 74, 134-139 (1913). Reviewer: Wallenberg, Prof. (Berlin) MSC: 34C05 PDF BibTeX XML Cite \textit{G. D. Birkhoff}, Math. Ann. 74, 134--139 (1913; JFM 44.0373.01) Full Text: DOI EuDML Link OpenURL