On the isomorphisms of the projective orthogonal groups and their congruence subgroups.
Journal für die reine und angewandte Mathematik, Tome 273 (1975), pp. 1-22.

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@article{JRAM_1975__273_151535,
     author = {Alexander J. Hahn},
     title = {On the isomorphisms of the projective orthogonal groups and their congruence subgroups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     pages = {1--22},
     publisher = {mathdoc},
     volume = {273},
     year = {1975},
     zbl = {0314.20032},
     url = {http://geodesic.mathdoc.fr/item/JRAM_1975__273_151535/}
}
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Alexander J. Hahn. On the isomorphisms of the projective orthogonal groups and their congruence subgroups.. Journal für die reine und angewandte Mathematik, Tome 273 (1975), pp. 1-22. http://geodesic.mathdoc.fr/item/JRAM_1975__273_151535/