G#+3. Bartolozzi, Bruno. New Sounds for Woodwind. London: Oxford University Press, 1971, p. 31.
x x x | x x x Ab a
G#+3. Reinhard, Johnny. "The Microtonal Bassoon." The Double Reed 10/2 (Fall 1987): 42. Also see Klimko, Ronald. "Bassoon Music Reviews." The Double Reed 16/1 (Spring 1993): 62. Contains fingerings for Johnny Reinhard's Dune for Bassoon (1990).
Eb x x x | x x x Ab c
G#+3. Vigder, Scott. "A Table of Quarter-Tone Fingerings for the Bassoon," The Double Reed 4/2 (October 1981): 44. These fingerings were extracted from Sergio Penazzi's Metodo per Fagotto (Edizoni Suvini Zerboni-Milano, 1971).
Db / x x | x x x Ab a
Fingerings for microtones