E2. Standard. Seltmann, Werner and Angerhöfer, Günter. Fagott-Schule in sechs Bänder, vol. 6 (Mainz: Schott), p. 131. Permission granted for inclusion in this WWW index by Deutcher Verlag für Musik.
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E2. Boerlin, Richard. In Apfelstadt, Marc and Klimko, Ronald. Bassoon Performance Practice, Teaching Materials, Techniques and Methods. Idaho: University of Idaho, 1993, p. 56.
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E2. Jolivet, Michel. The Double Reed 10/3 (Winter 1987): 21.
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