On the isomorphisms of the projective orthogonal groups and their congruence subgroups.
Hahn, Alexander J.
Journal für die reine und angewandte Mathematik, Tome 272 (1975), p. 1-22 / Harvested from Göttinger Digitalisierungszentrum
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Publié le : 1975-01-01
EUDML-ID : urn:eudml:doc:151535 
@article{GDZPPN002190109,
     title = {On the isomorphisms of the projective orthogonal groups and their congruence subgroups.},
     journal = {Journal f\"ur die reine und angewandte Mathematik},
     volume = {272},
     year = {1975},
     pages = {1-22},
     zbl = {0314.20032},
     url = {http://dml.mathdoc.fr/item/GDZPPN002190109}
}

Hahn, Alexander J. On the isomorphisms of the projective orthogonal groups and their congruence subgroups.. Journal für die reine und angewandte Mathematik, Tome 272 (1975) pp. 1-22. http://gdmltest.u-ga.fr/item/GDZPPN002190109/