@article{GDZPPN002207397,
title = {Rigidity of the arithmetic fundamental group of punctured projective line.},
journal = {Journal f\"ur die reine und angewandte Mathematik},
volume = {405},
year = {1990},
pages = {117-130},
zbl = {0687.14028},
url = {http://dml.mathdoc.fr/item/GDZPPN002207397}
}
Nakamura, Hiroaki. Rigidity of the arithmetic fundamental group of punctured projective line.. Journal für die reine und angewandte Mathematik, Tome 405 (1990) pp. 117-130. http://gdmltest.u-ga.fr/item/GDZPPN002207397/