B. Stadlober, G. Krug, R. Nemetschek, R. Hackl, JL. Cobb, JT. Markert: IS ND2-XCEXCUO4 A HIGH-TEMPERATURE SUPERCONDUCTOR. 1995Physical Review Letters: 74. ISBN 0031-9007 http://dx.doi.org/10.1103/PhysRevLett.74.4911