[1] Hung Y Y, Liang C Y. Image-shearing camera for direct measurement of surface strains. Appl. Opt., 1979, 18(7):1045~1051
[2] Hung Y Y. Shearography: a new optical method for strain measurement and nondestructive testing. Opt. Engng., 1982, 21(3):391~395
[3] Hung Y Y. Recent development in practical optical nondestructive testing. Proc. SPIE, 1991, 1554B:29~45
[8] Carre P. Installation et utilisation du comparateur photoelectrique et interferentiel du burean international des poids et mesures, Metrologia, 1966, 2(1):13~23