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3. Slope and curvature measurement by a double frequency grating shearing interferometer;Assa;Exp. Mech.,1979
4. An image shearing moiré method to record slopes in flexed plates;Subramanian;Strain,1984
5. A glass plate shearing interferometer for curvature contouring of flexed plates;Subramanian;Jl Struct. Engg.,1985