1. Lect. Notes Math.;R. Baeza,1978
2. Hoffmann D. W.,Isotropy of quadratic forms over the function field of a quadric, Math. Z.,220 (1995), 461–476.
3. Hoffmann D. W., Laghribi A.,Quadratic forms and Pfister neighbors in characteristic 2, Trans. Amer. Math. Soc.,356 (2004), 4019–4053.
4. Hoffmann D. W., Laghribi A.,Isotropy of quadratic forms over the function field of a quadric in characteristic 2, to appear in J. Algebra.
5. Hurrelbrink J., Rehmann U.,Splitting patterns of excellent quadratic forms, J. Reine Angew. Math.,444 (1993), 183–192.