Kasner, E. Intermediate curvatures in Riemann space. (English) JFM 49.0551.07 American M. S. Bull. 29, 150 (1923). PDFBibTeX XMLCite \textit{E. Kasner}, Bull. Am. Math. Soc. 29, 150 (1923; JFM 49.0551.07)
Kasner, E. Parallels and geodesics in Weyl’s affine geometry. (English) JFM 49.0551.06 American M. S. Bull. 29, 3 (1923). PDFBibTeX XMLCite \textit{E. Kasner}, Bull. Am. Math. Soc. 29, 3 (1923; JFM 49.0551.06)