@article{LOPEZ-PUERTAS05_JGR_OB,
   author = "M. L{\'o}pez-Puertas and B. Funke and S. Gil-L{\'o}pez and
             T. von Clarmann and G. P. Stiller and M. H{\"o}pfner and
	     S. Kellmann and H. Fischer and C. H. Jackman", 
   title  = "Observation of {NO}$_x$ Enhancement and Ozone Depletion in the
             Northern and Southern Hemispheres after the {O}ctober--{N}ovember
             2003 Solar Proton Events",
   journal= "J. Geophys. Res.",
   volume = "110",
   number = "A9", 
   eid    = "A09S43",
   doi    = " 10.1029/2005JA011050",
   year   = "2005"   }