Product Type Three-point Gauss-Legendre-Simpson's Integration [D1] (Algorithm A439) CACM December, 1972 Boland, W. R. numerical integration, product type quadrature, Gaussian quadrature, Simpson's rule 5.16 CA721214 JB January 27, 1978 9:06 AM 2241 5 2241 2241 5 2241 2241 5 2241