1. Mason, J.C, Orthogonal polynomial approximation methods in numerical analysis. In: “Approximation Theory”, A. Talbot (Ed.), Academic Press. London, 1970, pp 7–33.
2. Cheney, E.W. and Price, K.H. “Minimal projections”. Ibid pp 261–290.
3. Gunning, R.C, and Rossi, H. “Analytic functions of several complex variables”, Prentice-Hall, New Jersey, 1965.
4. Mason, J.C. Near-best multivariate approximation by Fourier series, Chebyshev series, and Chebyshev interpolation. J. of Approx. Th. 28 (1980), 349–358.
5. Geddes, K.O. and Mason, J.C. Polynomial approximation by projections on the unit circle. SIAM J. Numer. Anal. J 12 (1975), 111–120.