1. On conditions for the rationality of three-folds with a pencil of del Pezzo surfaces of degree 4;Alekseev;Mat. Zametki,1987
2. Quadratische Formen über Funktionenkorpern;Amer,1976
3. Exceptional collections of line bundles on projective homogeneous varieties;Ananyevskiy;Adv. Math.,2013
4. Clifford invariants of line bundle-valued quadratic forms;Auel;MPIM preprint series,2011