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4. G. Alefeld and J. Herzberger, Introduction to Interval Computations (New York-London: Academic Press, 1983).
5. V. Kreinovich, A. Lakeyev, J. Rohn, and P. Kahl, Computational Complexity and Feasibility of Data Processing and Interval Computations (Dordrecht: Kluwer Academic Publishers, 1998).