Modified Romberg Quadrature (Algorithm 351 $D1)) CACM April, 1970 Cook, N. D. numerical integration, Romberg quadrature, trapezoid values, rectangle values, error bound 5.16 CA700412 JB February 13, 1978 2:42 PM 2072 5 2072 2072 5 2072 2072 5 2072