@article{Reyniers:2339,
      author        = "Reyniers, M. and  Degroote, P. and  Bodewits, D. and 
                       Cuypers, J. and  Waelkens, C.",
      title         = "{The rotation and coma profiles of comet C/2004 Q2
                       (Machholz)}",
      year          = "2009",
}