@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" }