1. A Laboratory Investigation of the Photoelastic Stressmeter;Roberts;Int. J. Rock Mech. Mining Sci.,1964
2. Measurement of stress in the field by application of photoelasticity;Hiramatsu;Tech. Rep. Kyoto Univ.,1957
3. The application of photoelastic devices to the measurement of strata pressures and support loads;Roberts;Mine Quarry Engng,1963