bu-ur-bu-ur: OB Nippur Diri 108 (bur[spread]).
du-du: MAOG 3/3 47-55 o i 48- (dun[roam]), 54 (dug[speak]), 5658 (dun[roam]); KBo 08, 010 + KBo 26, 9 o ii 7'-11' (dun[roam]).
du-du: OB Nippur Diri 104 (dun[roam]); K 11392 13'-17' (dun[roam]).
zu-u: Emar 6/2, p. 486, Msk 74198d r i 8''.