Long term variability of Cygnus X-1 - III. Radio–X-ray correlations T. Gleissner, J. Wilms, G. G. Pooley, M. A. Nowak, K. Pottschmidt, S. Markoff, S. Heinz, M. Klein-Wolt, R. P. Fender and R. Staubert A&A, 425 3 (2004) 1061-1068 Published online: 28 September 2004 DOI: 10.1051/0004-6361:20040280