1. Intraorbital aerocoele;Haller, M.L.; Brackup, A.H.; Shiffman, F.;Arch Ophthalmol,1980
2. Post traumatic intraorbital pneumatocoele: a rare cause of unilateral exophthalmos;Pear, B.L.; Sanders, B.B.;BrJ Radiol,1971
3. Radiology of emergency medicine;Harris, J.H.; Harris, W.H.; Novelline, R.A.;and Williams
4. Neuroradiology;Burrows, E.H.; Leeds, N.E.,1981
5. A sign of intracranial involvement in orbital fracture;Waring, G.O.; Pneumocephalus, Flanagan J.C.;Arch Ophthalmol,1975