1. Beaumont, O.: Algorithmique pour les Intervalles, Ph.D. Thesis, Université de Rennes 1, 1999.
2. Beaumont, O.: Solving Interval Linear Systems with Oblique Boxes, Publication interne IRISA, 2000, http://www.irisa.fr/sage/publications/Category/RR.html.
3. Dimitrova, N. S., Markov, S. M., and Popova, E. D.: Extended Interval Aritrhmetics: New Results and Applications, in: Computer Arithmetics and Enclosure Methods, 1992, pp. 225–232.
4. Eijgenraam, P.: The Solution of Initial Value Problems Using Interval Arithmetic, Mathematical Centre Tracts 144, Stichting Mathematisch Centrum, Amsterdam, 1981.
5. Kaucher, E.: Interval Analysis in the Extended Interval Space, Computing, Suppl. 2 (1980), pp. 33–49.