
@Article{Berthold1875,
  author =       "G. Berthold",
  title =        "Zur {Geschichte} des {Princips} der {Erhaltung} der
                 {Kraft}.",
  journal =      "Pogg. Ann.",
  year =         "1875",
  volume =       "157",
  pages =        "342--352",
  ISSN =         "0003-3804",
  fjournal =     "Annalen der Physik und Chemie",
  jfm =          "08.0705.01",
  language =     "German",
  zbmath =       "2714806",
}