
@Article{Helmholtz1874a,
  author =       "H. Helmholtz",
  title =        "The theoretical limit of the efficacy of
                 microscopes.",
  journal =      "Pogg. Ann.",
  year =         "1874",
  pages =        "557--584",
  ISSN =         "0003-3804",
  fjournal =     "Annalen der Physik und Chemie",
  jfm =          "06.0663.02",
  keywords =     "78A55",
  language =     "German",
  zbmath =       "2717465",
}