^ Toczolowski J (1993). "Thirty years of cryoophthalmology". Ann Ophthalmol25 (7): 254–6. PMID 8363292.
^ Kiratli H, Bilgiç S (1998). "Cryoextraction in the management of orbital tumors. An old technique revisited". Orbit17 (3): 189–194. doi:10.1076/orbi.17.3.189.2753. PMID 12048727.