1. V. K. Dzyadyk, ?On the generalization of the moment problem,?Dokl. Akad. Nauk Ukr.SSR, Ser. A, No. 6, 8?12 (1981).
2. A. P. Golub, ?Some properties of biorthogonal polynomials,?Ukr. Mat. Zh.,41, No. 10, 1384?1388 (1989).
3. A. Iserles and S. P. Nørsett, ?Biorthogonal polynomials,?Lect. Notes Math.,1171, 92?100 (1985).
4. A. Iserles and S. P. Nørsett, ?On the theory of biorthogonal polynomials,?Math. Comput., No. 1, 42 (1986).
5. A. P. Golub,Application of the Generalized Moment Problem to the Padé Approximation of Some Functions [in Russian], Preprint No. 81.58, Institute of Mathematics, Ukrainian Academy of Sciences, Kiev (1981), pp. 16?56.