2000 — Noah Robischon, "Derision 2000", Entertainment Weekly, 13 November 2000:
Don't look to CNN, the New York Times, or the Drudge Report for this scoop: The transcript of Gore's early morning unconcession phone call to Bush.
2004 — Grant Barrett, The Oxford Dictionary of American Political Slang, Oxford University Press (2004), →ISBN, page 13:
In 2000, after Gore's unconcession, he demanded a recount of several Florida counties, although other states still had outstanding final tallies that could have affected the election
2004 — Paul Slansky, The George W. Bush Quiz Book, Broadway Books (2004), →ISBN, page 65:
Complete Al Gore's response to George W. Bush after he reacted badly to Gore's telephoned unconcession: […]