1. Zh. S. Akopyan and A. N. Guz', ?Variational principles of the stability theory of mine workings for compressible models,? Dokl. Akad. Nauk Ukr. SSR, Ser. A, No. 1, 33?35 (1981).
2. Zh. S. Akopyan and A. N. Guz', ?Variational principles of the stability theory of mine worings for incompressible models,? Dokl. Akad. Nauk Ukr. SSR, Ser. A, No. 10, 50?54 (1981).
3. Zh. S. Akopyan, A. N. Guz', and A. V. Navoyan, ?Stability of elastic?plastic bodies with omnidirectional compression,? Prikl. Mekh.,15, No. 12, 107?110 (1979).
4. Zh. S. Akopyan, A. N. Guz', and A. V. Navoyan, ?Constructing a stability theory of mine workings,? Prikl. Mekh.,18, No. 5, 3?26 (1982).
5. M. T. Alimzhanov, ?Stability of vertical mineshaft,? in: Materials of a Scientific Review Conference on Mathematics and Mechanics [in Russian], Nauka, Alma-Ata (1967), pp. 42?44.