@article{1183497557,
author = {Wall, H. S.},
title = {Continued fractions and cross-ratio groups of Cremona transformations},
journal = {Bull. Amer. Math. Soc.},
volume = {40},
number = {12},
year = {1934},
pages = { 587-592},
language = {en},
url = {http://dml.mathdoc.fr/item/1183497557}
}
Wall, H. S. Continued fractions and cross-ratio groups of Cremona transformations. Bull. Amer. Math. Soc., Tome 40 (1934) no. 12, pp. 587-592. http://gdmltest.u-ga.fr/item/1183497557/