1. Vector fields on spheres;Adams;Ann. Math.,1962
2. J.F. Adams, P.D. Lax, R.S. Phillips, On matrices whose real linear combinations are nonsingular, Proc. Amer. Math. Soc. 16 (1965) 318–322; Correction, Proc. Amer. Math. Soc. 17 (1966) 945–947.
3. On matrices whose nontrivial real linear combinations are nonsingular;Au-Yeung;Proc. Amer. Math. Soc.,1971
4. Two formulas for the generalized Radon–Hurwitz number;Au-Yeung;Linear Multilinear Algebra,1993
5. On the crossing rule;Friedland;Comm. Pure Appl. Math.,1984