1. V. M. Adamjan, D. Z. Arov and M. G. Krein, Infinite Hankel matrices and generalized problems of Carath�odory-Fej�r and I. Schur,Functional Anal. i Prilozen,2 (1968), pp. 1?19 (Russian).
2. V. M. Adamjan, D. Z. Arov and M. G. Krein, Infinite Hankel block matrices and related extension problems,Izv. Akad. Nauk. Armjan SSR, Matematika,6 (1971), pp. 87?112, (English TranslationAmer. Math. Soc. Trans.,III (1978), pp. 133?156).
3. R. Arocena, Generalized Toeplitz kernels and dilations of intertwining operators,Integral Equations Operator Theory,6 (1983), pp. 759?778.
4. D. Z. Arov and M. G. Krein, On computations of entropy functionals and their minima (Russian),Acta Sci. Math. (Szeged),45 (1983), pp. 51?66.
5. Gr. Arsene, Z. Ceausescu and C. Foias, On intertwining dilations VII,Proc. Coll. Complex Analysis, Joensuu, Lecture Notes in Math.,747 (1979), pp. 24?45.