1. N. V. Banichuk, ?Optimization of rod stability with and elastic framing,? Izv. Akad. Nauk SSSR, Mekh. Tverd. Tela, No. 4, 150?154 (1974).
2. E. L. Nikolai, ?Lagrange problem about the best support of a column,? Izv. Peterb. Politekh. Inst.,8, No. 1, 255?288 (1907).
3. A. P. Seiranyan, ?On a Lagrange problem,? Izv. Akad. Nauk SSSR, Mekh. Tverd. Tela, No. 2, 101?111 (1984).
4. S. P. Timoshenko, Stability of Elastic Systems [Russian translation], Gostekhizdat, Moscow (1946).
5. L. Young, Lectures on the Calculus of Variations and Optimal Control Theory, Saunders, Philadelphia (1969).