532,941 PROCEEDINGS Proceedings of the 11th Hellenic Ophthal— mological Congress. Tumours of the Eyeball Kassandra—Halkidiki June 16—18, 1978. Org. by the Ophthalmological Society of Northern Greece. Ed. by D. J. Polychro— nakos. Thessaloniki 1978 Printed by M. Trianta- fyllou Sons 8 s. 445, nlb. 2, il. [2- ga k. tyt. w jęz.grec., tekst część, w jęz. ang. grec., niem.,fr.]