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3. B. Holldobler and E. O. Wilson,The Ants, New York: Springer-Verlag (1990).
4. V. I. Arnold,Ordinary Differential Equations, Boston: M.I.T. Press (1973).
5. G. Boole,A Treatise on Differential Equations, 5th ed., London (1859), or H. T. Davis,Introduction to Nonlinear Differential and Integral Equations, New York: Dover (1962).