Wieman, Carl. The "Curse of Knowledge," or Why Intuition About Teaching Often Fails. APS News. The Back Page. 2007, 16 (10) [8 March 2012]. (原始内容存档于2012-08-29)
The term apicolabial is older, but Ladefoged and Maddieson point out that often these sounds are not apical. See p.270 of François, Alexandre. Araki: A
tediouſe repetition of theſe woordes : is equalle to : I will ſette as I doe often in woorke vſe, a paire of paralleles, or Gemowe lines of one lengthe, thus: