@article{JRAM_1990__405_153212,
     author = {Hiroaki Nakamura},
     title = {Rigidity of the arithmetic fundamental group of punctured projective line.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {117--130},
     publisher = {mathdoc},
     volume = {405},
     year = {1990},
     zbl = {0687.14028},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1990__405_153212/}
}