1. A New System for Fatigue Crack Growth Measurement and Control;Paris,1972
2. J. H. Fitzgerald and M. D. Griffiths, Preliminary Evaluation of Optical Crack Measurements vs FRACTOMAT Measurements and Automated, Computerized, FRACTOMAT Measurements. Support Services Laboratories, Northrop Corporation, Aircraft Division, Hawthorne, CA90250.
3. Automated Crack Growth Testing—Evaluation of a Bonded Foil Crack-Gage System;Pearson,1981
4. KRAK-GAGE; a New Transducer for Crack Growth Measurements;Hartmann,1981