1. Electron microscopic observations of the adrenal gland of the green toad Bufo viridis Laur;Abrahám;Acta Biol. (Szeged),1972
2. Electron microscopic observations of adrenal chromaffin cells in the frog Rana esculenta during embryonal development and metamorphosis;Accordi;Riv. Biol,1975
3. Electron microscopic differentiation of cell types in the frog's adrenal medulla;Benedeczy;Acta Morphol,1967
4. Observations on the form and size distribution of chromaffin granules and on the identity of adrenaline and noradrenaline-storing chromaffin cells in vertebrates and man;Coupland;Mem. Soc. Endocrinol,1971