Mecklenburg, Marion F., Joyce, J. A., and Albrecht, P. 1989. "
Separation of Energies in Elastic-Plastic Fracture." in
Elastic-Plastic Fracture, Volume II: Non-Linear Fracture Mechanics (ASTM STP 995), edited by Landes, J. D., Saxena, A., and Merkle, J. G., 594–612. Philadelphia: ASTM.