1. J.Kr. Arason, Excellence of F(ϕ)/F for 2-fold Pfister forms, 1977, Appendix II in [3].
2. Remarques sur les couples de formes quadratiques;Brumer;C.R. Acad. Sci. Paris Ser. A–B,1978
3. Amenable fields and Pfister extensions;Elman;Queen Pap. Pure Appl. Math.,1977
4. Isotropy of 5-dimensional forms over the function field of a quadric;Hoffmann;Proc. Symp. Pure Math.,1995
5. Minimal forms with respect to function fields of conics;Hoffmann;Manuscr. Math.,1995