Free access
Volume 12, Number 3, July 2006
Page(s) 398 - 408
Published online 20 June 2006
  1. B. Beauzamy, Introduction to Banach Spaces and their Geometry. North Holland, New York. Mathematics Studies 68 (1982).
  2. P. Hartman and A. Wintner, On an oscillation criterion of Liapunoff. Amer. J. Math. 73 (1951) 885–890. [CrossRef] [MathSciNet]
  3. A.C. Lazer and D.E. Leach, On a nonlinear two-point boundary value problem. J. Math. Anal. Appl. 26 (1969) 20–27. [CrossRef] [MathSciNet]
  4. Y. Li and H. Wang, Neumann boundary value problems for second order ordinary differential equations across resonance. SIAM J. Control Optim. 33 (1995) 1312–11325. [CrossRef] [MathSciNet]
  5. J. Mawhin, J.R. Ward and M. Willem, Variational methods and semi-linear elliptic equations. Arch. Rational Mech. Anal. 95 (1986) 269–277. [MathSciNet]
  6. E.R. Pinch, Optimal Control and the Calculus of Variations. Oxford University Press, New York (1993).
  7. W. Walter, Ordinary differential equations. Springer-Verlag, New York, Graduate Texts in Math. 182 (1998).