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@Book{Newton1999,
  title =     {The Principia: mathematical principles of natural philosophy},
  publisher = {Univ of California Press},
  year =      {1999},
  author =    {Newton, Isaac}
}

@Book{Darwin1888,
  title =     {The descent of man, and selection in relation to sex},
  publisher = {J. Murray},
  year =      {1888},
  author =    {Darwin, Charles}
}

@Book{Einstein1920,
  title =     {Relativity: The special and general theory},
  publisher = {Penguin},
  year =      {1920},
  author =    {Einstein, Albert}
}

@InBook{Einstein1920a,
  crossref =  {Einstein1920},
  pages = {22--23}
}

@InBook{Einstein1920b,
  crossref =  {Einstein1921},
  pages = {22--23}
}

@InBook{Einstein1920c,
  crossref =  {Einstein1920},
  pages = {25--33}
}

@Comment{jabref-meta: databaseType:bibtex;}
