1. M. P. Gomez, Effects of Loading Conditions on the Instability of Circumferential Cracks in Piping Systems, Washington University, Mechanical Engineering Report (1979).
2. H. Tada, P. Paris, and R. Gamble, Stability Analysis of Circumferential Cracks in Reactor Piping Systems, Report NUREG/CR-0838, U.S. Nuclear Regulatory Commission, also in Fracture Mechanics (Proceedings, 12th National Symposium on Fracture Mechanics), STP 700, American Society for Testing and Materials, Philadelphia, 1980 (to appear).