Sörensen, Om Lydorganer hos Fiske, Copenhagen, 1884; Dufossé, Ann. d. Sci. Nat. Ser. 5, xix. Art. 5, 1874, and xx. Art. 3, 1874. For references to earlier papers see Sörensen, op. cit.
Haddon, Journ. Anat. and Phys. xv. 1881, p. 322; Bridge and Haddon, Phil. Trans. 184, 1893, p. 168.
Möbius, Sitz. d. Berlin. Akad. d. Wiss. 1889, p. 999.
Notes by a Naturalist on H.M.S. "Challenger," London, 1879, p. 51.
The elastic-spring-mechanism has been described by several writers, who had assigned to it various functions, but Sörensen (op. cit. pp. 85-91) was the first to discover its vocal function by observations and experiments on Doras maculatus.