1. S. P. Timoshenko and J. Gere, Theory of Elastic Stability, 2nd ed., McGraw-Hill (1961).
2. Yu. N. Rabotnov, Elementary Aftereffect Mechanics of Solids [in Russian], Moscow (1977).
3. E. N. Popov, Nonlinear Problems in Statics of Thin Beams [in Russian], Leningrad-Moscow (1948).
4. R. Bellman and S. Dreyfus, Applied Dynamic Programming, Princeton Univ. Press (1962).
5. N. N. Moiseev, Numerical Methods in the Theory of Optimal Control [in Russian], Moscow (1968).