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2. BEST, F. (1906). Ibid., 33, 186.
3. BEST, F. (1907). Arch. Augenheilk., 57, 173.
4. BRAMMERTZ, W. (1915). Arch. mikr. Anat., 86, 1.
5. "Histological Technique;CARLETON, H.M.; LEACH, E.H.,1947