Spelling in »Gender and Uilleann piping« by Janice L. Waldron, according to whom "The Uilleann pipes are a fairly recent development in Irish history, having evolved from the warpipe or Piob Mar in the early 1700’s. The history of that instrument is therefore relevant to any discussion of the UPs", referring to Fintan Vallely (ed.): »The companion to Irish traditional music« (Cork, 1999).