Optical study of an untwinned (Bi1.57Pb0.43)Sr2CaCu2O8+8 single crystal: ab-plane anisotropyH. L. Liu, M. A. Quijada, D. B. Tanner, H. Berger and G. MargaritondoEur. Phys. J. B, 8 1 (1999) 47-56DOI: https://doi.org/10.1007/s100510050667