Kaszab Zoltán (szerk.): A Magyar Természettudományi Múzeum évkönyve 77. (Budapest 1985)

Kordos-Szakály, M. ; Kordos, L.: Morphotypes of Hungarian fossil Celtis (Urticales) stones

Cross-sectional microstructure of stony endocarps of fossil Celtis morphotypes : "oval", Rudabánya : 1 = outer, 2 = middle, 3 = inner zone; "macro", Rudabánya: 4 = outer, 5 = middle, 6 = inner zone; "torpedo", Polgárdi: 7 = outer, 8 = middle, 9 — inner zone; "pillow", Tarkő 16: 10 = outer, 11 = middle, 12 = inner zone. — All are SEM photos, magnified 3000 X Photo: Mrs. B. Takács and Mrs. L. Pellérdy