@article{LOPEZ-PUERTAS06_SSR,
   author = "M. L{\'o}pez-Puertas and B. Funke and T. von Clarmann and
             H. Fischer and G. P. Stiller",
   title  = "The stratospheric and mesospheric {NO}$_y$ in the 2002--2004
             polar winters as measured by {MIPAS/ENVISAT}",
   journal= "Space Sci. Rev.",
   volume = "125",
   pages  = "403-416",
   doi    = "10.1007/s11214-006-9073-2",
   year   = "2006"     }