1. Rafel, N. "Effect of Normal Pressure on the Critical Compressive Stress of Curved Sheet/' WR L-258,1942, NACA.
2. Rafel, N. "Effect of Normal Pressure on the Critical Shear Stress of Curved Sheet/' WR L-416,1943, NACA.
3. Rafel, N. and Sandlin, C. W., Jr. "Effect of Normal Pressure on the Critical Compressive and Shear Stress of Curved Sheet," WRL-57,1944, NACA.