1. Effects of changing stress amplitude on the rate of fatigue crack propagation of two aluminum alloys;Hudson;NASA Tech. Note D-960,1961
2. The results of a test programme based on a gust spectrum with variable amplitude loading;Schijve;Aircraft Engineering,1962
3. Crack propagation under variable amplitude loading;Schijve;NLR Report M 2094,1962
4. Metal Fatigue;Christensen,1959