1. On the cause of quenching deformation in tool steels;D Hattori;Sci. Rep. Tohoku Imp. Univ., Ser,1929
2. The detection of internal stresses in rods and tubes;G Sachs;Zeitschift f�r Metallkunde,1927
3. Determination of initial stresses by measuring the deformation around drilled holes;J Mathar;Trans. ASME,1934
4. Hole Drilling and Ring Coring