1. An illustrated guide to the slit lamp;Butler, T.H.
2. Posterior conical cornea;Jacobs, H.B.;Br J Ophthalmol,1957
3. The occurrence of congenital keratoconus posticus;Haney, W.P.; Falls, H.F.;Am J Ophthalmol,1961
4. Keratoconus posticus;Karlin, D.B.; Wise, G.N.;Am J Ophthalmol,1961
5. Bilateral posterior circumscribed keratoconus;Schocket, S.S.; Phelps, W.L.; Petit, T.H.;Am J Ophthalmol,1964