@misc{GruendePaterShowalteretal.2006,
  author    = {Gr{\"u}n, Eberhard and de Pater, Imke and Showalter, Mark and Spahn, Frank and Srama, Ralf},
  title     = {Physics of dusty rings: History and perspective},
  series = {Planetary and space science},
  volume    = {54},
  journal   = {Planetary and space science},
  number    = {9-10},
  publisher = {Elsevier},
  address   = {Oxford},
  issn      = {0032-0633},
  doi       = {10.1016/j.pss.2006.05.005},
  pages     = {837 -- 843},
  year      = {2006},
  language  = {en}
}
@misc{SpahnSeiss2015,
  author    = {Spahn, Frank and Seiss, Martin},
  title     = {Charges dropped},
  series = {Nature physics},
  volume    = {11},
  journal   = {Nature physics},
  number    = {9},
  publisher = {Nature Publ. Group},
  address   = {London},
  issn      = {1745-2473},
  pages     = {709 -- 710},
  year      = {2015},
  language  = {en}
}