1. W. Elber, Equivalent constant-amplitude concept for crack growth under spectrum loading, ASTM STP 595, ASTM, Philadelphia, PA, USA (1976) 236–250.
2. C. M. Hudson, A root-mean-square approach for predicting fatigue crack growth under random loading, ASTM STP 748, ASTM, Philadelphia, PA, USA (1981) 41–52.
3. J. C. Newman, A crack-closure model for predicting fatigue crack growth under aircraft spectrum loading, ASTM STP 748, ASTM, Philadelphia, PA, USA (1981) 53–84.
4. W. S. Johnson, Multi-parameter yield zone model for predicting spectrum crack growth, ASTM STP 748, ASTM, Philadelphia, PA, USA (1981) 85–102.
5. A. U. de Koning, A simple crack closure model for prediction of fatigue crack growth rates under variable amplitude loading, ASTM STP 743, ASTM, Philadelphia, PA, USA (1981) 63–85.