@article{PMIHES_1993__78__187_0,
author = {Schwartz, Richard Evan},
title = {Pappus's theorem and the modular group},
journal = {Publications Math\'ematiques de l'IH\'ES},
volume = {78},
year = {1993},
pages = {187-206},
zbl = {0806.57004},
language = {en},
url = {http://dml.mathdoc.fr/item/PMIHES_1993__78__187_0}
}
Schwartz, Richard Evan. Pappus's theorem and the modular group. Publications Mathématiques de l'IHÉS, Tome 78 (1993) pp. 187-206. http://gdmltest.u-ga.fr/item/PMIHES_1993__78__187_0/
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