1. Brit;BEDFORD, M.A.; MACFAUL, P.A.;J. Ophthal; Klin,1969
2. Texas med;Mosby, St Louis G.I.L.L.E.T.T.E.; R.; BODENSTEIN, D.;J; In "Ocular and Adnexal Tumors,1946
3. Amer;Boniuk;J. Ophthal,1965
4. Amer;LINCOFF, H.; McLEAN, j; LONG, R.;J. Ophthal; Brit,1967
5. Brit;STALLARD, H.B.; MILNER, J.G.;J. Ophthal; Tumors of the Eye,1931