Conditions for optimum photothermal discrimination of subsurface thermal inhomogeneities U. Seidel, A. Glazov, K. Haupt, H.G. Walther, J. Burt, B.K. Bein et J. Pelzl J. Phys. IV France, 04 C7 (1994) C7-555-C7-558 DOI: 10.1051/jp4:19947130