1. V. S. Medvedev, "Investigation of the vibrations of buildings under seismic loads," Trudy IFZ, No. 5, 172 (1959).
2. S. V. Medvedev, "Effect of internal friction forces on the vibration of buildings during earthquakes," Trudy Geofiz. In-ta, No. 36, 163 (1956).
3. A. A. Kharkevich, Spectra and Analysis [in Russian], Fizmatgiz, Moscow (1962).
4. N. P. Grudeva, L. N. Malinovskaya, and B. N. Naimark, "Approximate calculation of seismic vibration spectra," in: Computational Seismology, Vol. 3 [in Russian], Nauka, Moscow (1967).
5. Building in Seismic Regions. Design Standards. Construction Specifications and Regulations II-A.12-69 [in Russian], Stroiizdat, Moscow (1970).