1. Kirby DB. Tissue culture in ophthalmic research. Trans Am Ophthalmol Soc. 1929;27:334–83.
2. Smith DT. Melanin pigment in the pigmented epithelium of the retina of the embryo chick’s eyes: studies in vivo and in vitro. Acat Rec. 1920;18:260.
3. Smith DT. The ingestion of melanin pigment granules by tissue cultures. Bull Johns Hopkins Hosp. 1921;22:240.
4. Strangeways TS, Canti RG. Dark-ground illumination of tissue cells cultivated “in vitro”. Br Med J. 1926;2(3420):155–7.
5. Strangeways TS, Fell HB. Experimental studies on the differentiation of embryonic tissues growing in vivo and in vitro.—II. The development of the isolated early embryonic eye of the fowl when cultivated in vitro. Proc R Soc B. 1926;100(703):273–83.