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2. Tumoren des tranensacks;Radnot;Ophthalmologica,1966
3. Cancer of the lacrimal sac. Presentation of five cases and review of the literature;Scheneck;Ann Otol Rhinol Laryngol,1973
4. Innocent, pigmented naevus-cell tumor (melanoma) of the lacrimal sac;Eitrem;Acta Ophthalmol,1953
5. Episcleral lymphoma and double-sided lymphoma of the lachrymal gland;Rollet;Arch Ophthalmol,1905