@Article{         EilenbergMcLane,
  Author        = "Eilenberg, Samuel and MacLane, Saunders",
  date-added    = "2014-10-26 06:55:15 +0000",
  date-modified = "2017-07-19 07:30:21 +0000",
  Keywords      = "category theory and classic",
  Month         = "September",
  Title         = "General Theory of Natural Equivalences",
  Year          = "1945",
  File          = "General Theory of Natural Equivalences - Eilenberg, MacLane (0) (0) - a - a - i.pdf"
}

@Article{ EilenbergMcLane, Author = "Eilenberg, Samuel and MacLane, Saunders", date-added = "2014-10-26 06:55:15 +0000", date-modified = "2017-07-19 07:30:21 +0000", Keywords = "category theory and classic", Month = "September", Title = "General Theory of Natural Equivalences", Year = "1945", File = "General Theory of Natural Equivalences - Eilenberg, MacLane (0) (0) - a - a - i.pdf" }