1. AWA. A software package for validated solution of ordinary differential equations, http://www.cs.utep.edu/interval-comp/intsoft.html
2. The GNU multi precision library, http://www.swox.com/gmp/
3. Studies in Logic and the Foundations of Mathematics;O. Aberth,1970
4. Abramsky, S., Jung, A.: In: Abramsky, S., Gabbay, D.M., Maibaum, T.S.E. (eds.) Handbook of Logic in Computer Science, vol. 3, Clarendon Press, Oxford (1994)
5. Aubin, J.P., Cellina, A.: Differential Inclusions. Springer, Heidelberg (1984)