1. P. M. TOOR: Ph.D. thesis, 1968, Imperial College, University of London.
2. T. H. TOPPER and C. V. B. GOWDA: paper presented at design engineering conference and show, Chicago, Illinois, May 1970, American Society of Mechanical Engineers paper no.70-DE-24.
3. R. M. WETZEL et al: 'Fatigue of notched parts with emphasis on local stresses and strains', report no. NADC-ST-6818; 1968, Warminster, Pennsylvania, Naval Air Development Centre.