1. D. K. Kahaner, private communication.
2. D. K. Kahaner, G. Monegato, ‘Nonexistence of Extended Gauss-Laguerre and Gauss-Hermite Quadrature Rules with Positive Weights’, Z. Angew. Math. Phys.29, 983–986, 1978.
3. A. S. Kronrod, Nodes and Weights for Quadrature Formulae. Sixteen-places tables, ‘Nauka’, Moscow, 1964; English transl., Consultants Bureau, New York. 1965.
4. V. I. Krylov, Approximate Calculation of Integrals, translated by A. H. Stroud, Macmillan, New York. 1965.
5. G. Monegato, ‘A Note on Extended Gaussian Quadrature Rules’, Math. Comp.30, 812–817, 1976.