Eb+4. Bartolozzi, Bruno. New Sounds for Woodwind. London: Oxford University Press, 1971, p. 32.

    Db
x x o | o x x 
   c#  Bb

Eb+4. Reinhard, Johnny. "The Microtonal Bassoon." The Double Reed 10/2 (Fall 1987): 42.

x x o | x x x
         E
    D

Eb+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).

    Eb
x x o | o x x
       Bb
  C D

Fingerings for microtones