1. Invariance properties of thematic factorizations of matrix functions;Alexeev;J. Funct. Anal.,2001
2. The solution sets of extremal problems in H1;Hayashi;Proc. Amer. Math. Soc.,1985
3. On some extremal problems of the theory of analytic functions;Khavinson;Uchen. Zap. Mosk. Univ. Matem.,1951
4. A characterization of badly approximable functions;Poreda;Trans. Amer. Math. Soc.,1972
5. Hankel operators and their applications;Peller,2003