1. Obert, L., Duvall, W. I.: Microseismic Method of Predicting Rock Failure in Underground Mining, Parts I and II, R. I. 3797 and 3803, USDI, Bureau of Mines, 1946.
2. Hodgson, E. A.: Trans. of the Canadian Inst. of Min. and Metal., Toronto, Ontario, Canada, Vol. 46, 1943, p. 313.
3. McCabe, W. M.: Acoustic Emissions in Coal: A Laboratory Study, Proc. 2nd Conf. on AE/MS in Geologic Structures and Materials, Trans. Tech. Publ., 1980.
4. Blake, W., Leighton, F., Duvall, W. I.: Microseismic Techniques for Monitoring the Behavior of Rock Structures, Bulletin 665, USDI, Bureau of Mines, 1974, p. 66.
5. Hardy, H. R., Jr., Leighton, F. W., Eds.: Proceedings First Conference on Acoustic Emission/Microseismic Activity in Geologic Structures and Materials, Trans. Tech. Publ., 1977.