1. Coleman, D.J., Lizzi, F. L. & Jack, R.L. Ultrasonography of the eye and orbit. Philadelphia: Lea & Febiger Ed. (1977).
2. Mazzeo, V. Ecografia dell’apparato oculare. Testo-Atlante. Milano: Fogliazza Ed. (1987).
3. McLean, I.W., Foster, W.D. & Zimmerman, L.E. Prognostic factors in small malignant melanoma of choroid and ciliary body. Arch. Ophthalmol. 95: 48 (1977).
4. McLean, LW., Foster, W.D. & Zimmerman, L.E. Uveal melanoma: location, size, cell type and enucleation as risk factors in metastasis. Hum. Pathol. 13: 123 (1982).
5. Ossoinig, K.C. & Blodi, F.C. Preoperative differential diagnosis of tumors with echography. In: Blodi, F.C. (ed.) Current concepts in ophthalmology. St. Louis: The C.V. Mosby Co. (1974).