1. Armand, J.L., Application of the optimal control theory to structural optimization; an analytical and numerical approach. In: Proc. I UTAM Symp. Optimization in Structural Design, Warsaw, 1973, Springer-Verlag, Berlin 1975, pp. 15–39.
2. Armand, J.L., Lur’e, K.A., and Cherkaev, A.V., On solution of problems in optimization of eigenvalues, which occur in designs of elastic structures, Izv. Akad. Nauk U.S.S.R., M.T.T., 1978, No. 5, pp. 159–162.
3. Armand, J.L., Lur’e, K.A., and Cherkaev, A.V., On the solution of optimization problems with singularities. In: New Directions in Optimal Structural Design, E. Atrek et al. (eds.), Chichester, Wiley, 1984, pp. 211–229.
4. Banichuk, N.V., and Karihaloo, B.L., On the solution of optimization problems with non-smooth extremals. Intern. J. Solids Structures,1977. 13,No. 8, pp. 725733.
5. Banichuk, N.V., and Karihaloo, B.L., On the solution of optimization problems with non-smooth extremals. In: Proc. Sixth Canadian Congress Appl. Mech., Vancouver, Canada, 1977, pp. 959–960.