References
- C. Cowen, Hyponormality of Toeplitz operators, Proc. Amer. Math. Soc. 103(1988), 809-812. https://doi.org/10.1090/S0002-9939-1988-0947663-4
- C. Foias and A. Frazo, The commutant lifting approach to interpolation prob- lems, Operator Theory: Adv. Appl. vol 44, Birkhauser, Boston, 1993.
- C. Gu and J.E. Shapiro, Kernels of Hankel operators and hyponormality of Toeplitz operators, Math. Ann. 319(2001), 553-572. https://doi.org/10.1007/PL00004449
- W. Y. Lee, Cowen sets for Toeplitz operators with finite rank selfcommuta- tors, J. Operator Theory 54(2)(2005), 301-307.
- Z. Nehari, On bounded bilinear forms, Ann. of Math. 65(1957), 153-162. https://doi.org/10.2307/1969670