1. Arafa SZA (2012a) Ultrastructure of vitellocytes in Electrotaenia malopteruri (Fritsch, 1886) (Cestoda: Proteocephalidae), a parasite of Malapterurus electricus (Siluriformes: Malapteruridae) from Egypt. Life Sci J 9:1410–1414
2. Arafa SZA (2012b) Light and electron microscopic study on vitellogenesis of the caryophyllidean cestode Monobothrioides chalmersius (Woodland, 1924) Hunter, 1930 (Lytocestidae) from the catfish Clarias gariepinus. J Basic Appl Zool 65:125–132
3. Björkman N, Thorsell W (1963) On the fine morphology of the formation of the eggshell globules in vitelline glands of the liver fluke (Fasciola hepatica L.). Exp Cell Res 39:18–28
4. Bruňanská M (1997) Proteocephalus exiguus La Rue 1911 (Cestoda, Proteocephalidae): ultrastructure of the vitelline cells. Helminthologia 34:9–13
5. Bruňanská M (1999) Ultrastructure of primary embryonic envelopes in Proteocephalus longicollis (Cestoda, Proteocephalidea). Helminthologia 36:83–89