The distant activity of the Long Period Comets C/2003 O1 (LINEAR) and C/2004 K1 (Catalina)E. Mazzotta Epifani, P. Palumbo, M. T. Capria, G. Cremonese, M. Fulle and L. ColangeliA&A, 502 1 (2009) 355-365DOI: https://doi.org/10.1051/0004-6361/200811527
