1. Local versus global strategies for adaptive quadrature;Malcolm;ACM Trans. on Math. Softw.,1975
2. Numerical integration over an N-dimensional rectangular region;Philips;Comp. J.,1967
3. Approximate calculation of multiple integrals;Stroud,1971
4. An algorithm for automatic integration;Piessens;Angewandte Informatik,1973
5. A quadrature routine with round-off error guard;Piessens,1974