TP. Devereaux, D. Einzel, B. Stadlober, R. Hackl, DH. Leach, JJ. Neumeier: ELECTRONIC RAMAN-SCATTERING IN HIGH-T(C) SUPERCONDUCTORS - A PROBE OF DX2-Y2 PAIRING. 1994Physical Review Letters: 72. ISBN 0031-9007 http://dx.doi.org/10.1103/PhysRevLett.72.396