1. Aubaret E (1909) cited by SE Whitnall (1921) [54]
2. Bochdalek VA (1868) cited by SE Whitnall (1921) [54] and M Yamada et al (1973) [58]
3. Böhme G (1992) Das Auge. In: Lehrbuch der Anatomie der Hausiere, Bd. IV, 3. Aufl., Nickel R, Schummer A, Seiferle E (eds), Paul Paray, Hamburg, Berlin, pp 430–432
4. Bradley OC (1933) M. retractor bulbi (oculi) in carnivora and ungulata. J Anat (London) 68: 65–74
5. Bron J, Tripathi RC, Tripathi BJ (eds) (1997) Wolff's Anatomy of the eye and the orbit, 8th ed., Chapman & Hall London, pp 107–177