@Unpublished{     Terrell_2009aa,
  author        = {Terrell, Robert E.},
  file          = {Terrell_2009aa.pdf},
  group         = {casper},
  internal      = {0},
  keywords      = {differential-forms},
  langid        = {english},
  title         = {The Fundamental Theorem of Calculus and the {Poincaré} Lemma},
  year          = {2009}
}

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