1. Persistent remnants of fetal hyaloid artery;DeBeck;Monograph, Annals of Ophth.,1890
2. Pathology of the eye;Parsons;New York, The Macmillan Co.,1906
3. Opaque Canal of Cloquet with Persistent Hyaloid Artery
4. Yudkin, Arthur. Arch. of Ophth., v. 55, p. 364.