1. Alefeld, G. and Herzberger, J. (1983), Introduction to Interval Computations, Academic Press, New York.
2. Asaithambi, N. S., Shen, Z., and Moore, R. E. (1982), On Computing the Range of Values, Computing 28, 225?237.
3. Bauch, H., Jahn, K. U., Oelschlägel, D., Süsse, H., and Wiebigke, V. (1987), Intervall-mathematik, Teubner, Leipzig.
4. Caprani, O. and Madsen, K. (1979), Interval Methods for Global Optimization, Report NI 79-09, Technical University of Denmark.
5. Clarke, F. H. (1983), Optimization and Nonsmooth Analysis, Wiley, New York.