First XMM-Newton observations of an isolated neutron star: RX J0720.4-3125F. Paerels, K. Mori, C. Motch, F. Haberl, V. E. Zavlin, S. Zane, G. Ramsay, M. Cropper and B. BrinkmanA&A, 365 1 (2001) L298-L301DOI: https://doi.org/10.1051/0004-6361:20000059