C#+4. Bartolozzi, Bruno. New Sounds for Woodwind. London: Oxford University Press, 1971, p. 32.
Eb x x x | o x x F c# Bb
C#+4. Klimko, Ronald. "Bassoon Music Reviews." The Double Reed 16/1 (Spring 1993): 62. Contains fingerings for Johnny Reinhard's Dune for Bassoon (1990).
x x x | x o x c# F#
C#+4. Reinhard, Johnny. "The Microtonal Bassoon." The Double Reed 10/2 (Fall 1987): 42.
Eb x x x | x o x c# F#
C#+4. 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).
c# x x x | o o x F c# Bb