1. V. I. Ivanov and N. I. Belov, ?Features of core breaking in drilling boreholes as criterion for predicting rock-burst hazard,? in: Prediction and Prevention of Rock Bursts in Ore Deposits [in Russian], KFAN SSSR, Apatity (1966).
2. N. I. Belov, Yu. G. Gorbunov, V. I. Ivanov, et al., Procedural Recommendations for Studying the Stress-Strain State of Rocks in Different Stages of Geological Surveying (MR 41-06-079-86) [in Russian], VNIIgeoinformsistem, Moscow (1987).
3. Sugawara Katsuhiko, Kameoka Yoshitomo, Saito Toshiaka, Oka Yukitoshi, and Hiramatsy Yoshio, ?A study on core discing of rocks,? J. Mining Metallurgy,94, No. 1098 (1978).
4. I. A. Tuchaninov, G. A. Markov, V. I. Ivanov, and A. V. Kozyrev, Tectonic Stresses in the Earth's Core and the Stability of Mine Workings [in Russian], Nauka, Leningrad (1978).