1. Uniqueness of the operator attaining C(Hn, p, zn);Dostál;Časopis P̌est. Mat.,1978
2. Polynomials of the eigenvalues and power of matrices;Dostál;Comment. Math. Univ. Carolinae,1978
3. Critical exponent of operators with constrained spectral radius;Dostál;Comment. Math. Univ. Carolinae,1978
4. On the norm and spectral radius;Flanders;Linear and Multilinear Algebra,1974
5. Sur la norme des fonctions de certains opérateurs;Sz.-Nagy;Acta Math. Acad. Sci. Hungar.,1969