1. D. S. Gorshkov, ?Cubic fields and symmetric matrices,? Dokl. Akad. Nauk SSSR,31, 842?843 (1941).
2. D. K. Faddeev, ?On a problem of analytic geometry,? Dokl. Akad. Nauk SSSR,47, 559?561 (1945).
3. D. K. Faddeev, ?On characteristic equations of rational symmetric matrices,? Dokl. Akad. Nauk SSSR,58, 753?754 (1947).
4. D. K. Faddeev, ?On the representation of algebraic numbers by matrices,? Zap. Nauchn. Sem. Leningr. Otd. Mat. Inst.,46, 89?91 (1974).
5. A. P. Shapiro, ?On characteristic polynomials of rational symmetric matrices of third order,? Dokl. Akad. Nauk SSSR,119, 890?893 (1958).