Divisible subgroups of Brauer groups and trace forms of central simple algebras. Berhuy, Grégory; Leep, David B. — 2001 Documenta Mathematica
Pfister's conjecture on quadratic Co-fields. David B. Leep — 1990 Journal für die reine und angewandte Mathematik
Biquaternion algebras and quartic extensions Tsit Yuen Lam; David B. Leep; Jean-Pierre Tignol — 1993 Publications Mathématiques de l'IHÉS