B. Stadlober, G. Krug, R. Nemetschek, M. Opel, R. Hackl, D. Einzel, C. Schuster, TP. Devereaux, L. Forro, JL. Cobb, JT. Markert, JJ. Neumeier: Study of k-dependent electronic properties in cuprate superconductors using Raman spectroscopy. 1995Journal of Physics and Chemistry of Solids: 56. ISBN 0022-3697 http://dx.doi.org/10.1016/0022-3697(95)00187-5