Order of torsion in of quadrics.
Orderings of Higher Level and Semilocal Rings.
Orderings under field extensions.
Ordnungen von Quaternionenalgebren über lokalen Körpern.
Original title unknown
Orthogonal Decomposition of Modular Quadratic Forms.
Orthogonal representations of Galois groups, Stiefel-Whitney classes and Hasse-Witt invariants.