1. CHIHARA, T.S. An Introduction to Orthogonal Polynomials, Gordon and Breach, New York, 1978.
2. CHRISTOFFEL, E.B. Über die Gaußische Quadratur und eine Verallgemeinerung derselben, J. Reine Angew. Math. 55 (1858), 61–82. [Ges. Math. Abhandlungen I, 65–87.]
3. GALANT, D. An implementation of Christoffel’s theorem in the theory of orthogonal polynomials, Math. Comp. 25 (1971), 111–113.
4. GAUTSCHI, W. Minimal solutions of three-term recurrence relations and orthogonal polynomials, Math. Comp. 36 (1981), 547–554.
5. GOLUB, G.H. and WELSCH, J.H. Calculation of Gauss quadrature rules, Math. Comp. 23 (1969), 221–230.