環上の射影直線
Ancochea, G. (1941), “Le théorèm de von Staudt en géométrie projective quaternionienne”, Journal für Mathematik , Band 184, Heft 4, SS. 193–8.
Limaye, N. B. (1972), “Cross-ratios and Projectivities of a line”, Mathematische Zeitschrift 129: 49–53 , MR0314823.
Limaye, B.V.; Limaye, N.B. (1977), “The Fundamental Theorem for the Projective Line over Commutative Rings”, Aequationes Mathematica 16: 275–81 . MR0513873.
Limaye, B.V.; Limaye, N.B. (1977), “The Fundamental Theorem for the Projective Line over Non-Commutative Local Rings”, Archiv der Mathematik 28 (1): 102–9 , MR0480495.
Wild, Marcel (2006), “The Fundamental Theorem of Projective Geometry for an Arbitrary Length Two Module”, Rocky Mountain Journal of Mathematics 36 (6): 2075–80 .