Photometry and imaging of comet C/2004 Q2 (Machholz) at Lulin and La Silla Z. Y. Lin, M. Weiler, H. Rauer and W. H. Ip A&A, 469 2 (2007) 771-776 Published online: 24 April 2007 DOI: 10.1051/0004-6361:20077286