@article{FUNKE07_GRL_COMM,
   author = "B. Funke and M. L{\'o}pez-Puertas and H. Fischer and
             G. P. Stiller and T. von Clarmann and G. Wetzel and B. Carli
             and C. Belotti",
   title  = "Comment on 'Origin of the {J}anuary-{A}pril 2004 increase in
             stratospheric {NO}$_2$ observed in northern polar
             latitudes' by J.-B. Renard et al.",
   journal= "Geophys. Res. Lett.",
   volume = "34",
   eid    = "L07813",
   doi    = "10.1029/2006GL027518",
   year   = "2007"    }