@Article{         labelle,
  Author        = "Labelle, Gilbert and Lamathe, Cedric",
  date-added    = "2023-03-12 20:29:39 +0100",
  date-modified = "2023-03-12 20:29:54 +0100",
  Journal       = "S{\'e}minaire Lotharingien de Combinatoire [electronic only]",
  Month         = "01",
  Title         = "A theory of general combinatorial differential operators",
  Year          = "2007",
  File          = "A theory of general combinatorial differential operators - 30 - a.pdf"
}

@Article{ labelle, Author = "Labelle, Gilbert and Lamathe, Cedric", date-added = "2023-03-12 20:29:39 +0100", date-modified = "2023-03-12 20:29:54 +0100", Journal = "S{\'e}minaire Lotharingien de Combinatoire [electronic only]", Month = "01", Title = "A theory of general combinatorial differential operators", Year = "2007", File = "A theory of general combinatorial differential operators - 30 - a.pdf" }