1. Amer;CHEE, P.H.Y.;J. Ophthal,1968
2. In "Ocular and Adnexal Tumors";HOWARD, G.M.;Ibid,1966
3. Brit;MACFAUL, P.A.; BEDFORD, M.A.;J. Ophthal,1970
4. Arch;MARTIN, H.; REESE, A.B.;Ophthal. (Chicago); Trans,1945
5. Acta radiol;PERRERS-TAYLOR, M.; BRINKLEY, D.; REYNOLDS, T.;Ther. Phys. Biol; Ann. roy,1965