1. Relationen in orthogonalen Gruppen;Ahrens;J. Reine Angew. Math.,1969
2. Aufbau der Geometrie aus dem Spiegelungsbegriff;Bachmann,1973
3. Decomposition of orthogonal, symplectic, and unitary isometries into simple isometries;Ellers;Abh. Math. Sem. Univ. Hamburg,1977
4. Relations in classical groups;Ellers;J. Algebra,1978
5. Radical relations in unitary, symplectic, and orthogonal groups;Ellers;J. Reine Angew. Math.,1979