@article{LOPEZ-PUERTAS05_JGR_HN,
   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. Höpfner and S. Kellmann
             and G. {Mengistu Tsidu} and H. Fischer and C. H. Jackman", 
   title  = "{HNO}$_3$, {N}$_2${O}$_5$ and {ClONO}$_2$ Enhancements after the
             {O}ctober--{N}ovember 2003 Solar Proton Events",
   journal= "J. Geophys. Res.",
   volume = "110",
   number = "A9",
   eid    = "A09S44",
   doi    = " 10.1029/2005JA011051",
   year   = "2005"   }