1. AVERSHIN, S. G. Some new methods and results of experimental investigations into manifestations of rock pressure around the face area during the extraction of coal seams. Int. Conference on Strata Control, Paris, 1960.
2. A linear strain seismograph;BENIOFF;Bull. Seism. Soc. Am.,1935
3. Earth strain measurements with a laser interferometer;BURGER;Science,1970
4. CHRZANOWSKI, A. New techniques in mine orientation surveys. Proc. 1st Canadian Symposium on Mine Surveying and Rock Deformation Measurements, Univ. New Brunswick, 1966, pp. 23–46.
5. DHIR, R. K. and HAWKES, I. The measurement of stress change in concrete using the biaxial photoelastic stressmeter. Conference on Experimental Methods of Investigating Stress & Strain in Structures, Prague, 1965.