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Lawergren 2000, p. 122. Lawergren, Bo (2000). "Extant Silver Pipes from Ur, 2450 BC"(PDF). In Hickmann, Ellen; Laufs, Ingo; Eichmann, Ricardo (eds.). Music Archaeology of Early Metal Ages, Studien zur Musikarchäologie: Studies in Music Archaeology. Vol. 2: Papers from the 1st Symposium of the International Study Group on Music Archaeology, Monastery Michaelstein, Blankenburg, Sachsen–Anhalt, Germany, May 18–24, 1988. Rahden: Verlag Marie Leidorf, GmbH [de]. pp. 121–132. ISBN978-3-89646-637-2.
Lawergren 2000, p. 123. Lawergren, Bo (2000). "Extant Silver Pipes from Ur, 2450 BC"(PDF). In Hickmann, Ellen; Laufs, Ingo; Eichmann, Ricardo (eds.). Music Archaeology of Early Metal Ages, Studien zur Musikarchäologie: Studies in Music Archaeology. Vol. 2: Papers from the 1st Symposium of the International Study Group on Music Archaeology, Monastery Michaelstein, Blankenburg, Sachsen–Anhalt, Germany, May 18–24, 1988. Rahden: Verlag Marie Leidorf, GmbH [de]. pp. 121–132. ISBN978-3-89646-637-2.