Gravity field determination of a Comet Nucleus: Rosetta at P/Wirtanen M. Pätzold, B. Häusler, A. Wennmacher, K. Aksnes, J. D. Anderson, S. W. Asmar, J.-P. Barriot, H. Boehnhardt, W. Eidel, F. M. Neubauer et al. (4 more) A&A, 375 2 (2001) 651-660 Published online: 15 August 2001 DOI: 10.1051/0004-6361:20010829