1. P. M. S. Blackett, Studies of War, Hill and Wang, NY, 1962.
2. William Boyce and Richard DiPrima, Elementary Differential Equations, 3rd. ed., John Wiley & Sons, NY, 1977.
3. Frederick W. Lanchester, “Mathematics in Warfare,” The World of Mathematics, Vol. 4, James R. Newman, editor. Simon & Schuster, NY, 1956, pp. 2138–2157.