The Anomalous X-ray Pulsar 4U 0142+61: Variability in the infrared and a spectral break in the opticalF. Hulleman, M. H. van Kerkwijk and S. R. KulkarniA&A, 416 3 (2004) 1037-1045DOI: https://doi.org/10.1051/0004-6361:20031756
