1. Local orthogonal groups over 2-adic fields;Chang,1971
2. On Witt's theorem for unimodular quadratic forms II;James;Pacific J. Math.,1970
3. Normal subgroups of integral orthogonal groups;Kneser,1969
4. On the orthogonal groups of unimodular quadratic forms. II;Wall;J. Reine Angew. Math.,1963