Yano, Kentaro; Hiramatu, Hitosi On the projective geometry of \(K\)-spreads. (English) Zbl 0048.16101 Compos. Math. 10, 286-296 (1952). PDF BibTeX XML Cite \textit{K. Yano} and \textit{H. Hiramatu}, Compos. Math. 10, 286--296 (1952; Zbl 0048.16101) Full Text: Numdam EuDML OpenURL
Levine, Jack Collineations in generalized spaces. (English) Zbl 0044.37502 Proc. Am. Math. Soc. 2, 447-455 (1951). PDF BibTeX XML Cite \textit{J. Levine}, Proc. Am. Math. Soc. 2, 447--455 (1951; Zbl 0044.37502) Full Text: DOI OpenURL