1. R.J. Charles and W.B. Hillig The Kinetics of Glass Failure by Stress Corrosion, Symposium on the Mechanical Strength of Glass and Ways of Improving It, Union Scientifique Continentale du Verre, 1961.
2. M. Creager The Elastic Stress Field Near the Tip of a Blunt Crack, Master's Thesis, Lehigh University, 1966.