Kozhan, E. A., V. G. Sugak, and A. V. Sugak. “Geo-Radar Sounding of Near-Surface Structure of Soil of the National Reserve «Sofiya Kievskaya» in the Territory of the Cyril’s Church”. Geofizicheskiy Zhurnal, vol. 32, no. 3, June 2010, pp. 43-49, doi:10.24028/gzh.0203-3100.v32i3.2010.117531.