@Article{ 
  dapmug04a,
  author = { D'Aprile, Teresa and Mugnai, Dimitri },
  title = { Existence of Solitary Waves for the Nonlinear Klein-Gordon-Maxwell and Schrödinger-Maxwell Equations },
  journal = { Proc. Roy. Soc. Edinburgh Sect. A. },
  year = { 2004 },
  volume = { 134 },
  number = { 5 },
  pages = { 893-906 },
  URL = { http://cvgmt.sns.it/paper/1625/ },
  note = { cvgmt preprint}
}