1. J. Berntsen, Private communication.
2. E. de Doncker, An Adaptive Extrapolation Algorithm for Automatic Integration. SIGNUM Newsletter 13 (1978), 12–18.
3. E. de Doncker-Kapenga and D.K. Kahaner, Adaptive Integration over a Triangulated Region, Unpublished.
4. J.A. Katpenga and E. de Doncker, A Parallelization of Adaptive Task Partitioning Algorithms, Submitted for publication.
5. E. de Doncker and I. Robinson, An Algorithm for Automatic Integration over a Triangle using Nonlinear Extrapolation. ACM Trans Math. Softw. 10, 1 (1984), 1–16.