1Trwin S W B,Threadgold L T 1972. Electron microscope studies of Fasciola hepatica. X Egg formation. Experimental parasitolgy 1972.31 (3) :321-331.
2Ujiie N 1936 B On the process of egg shell formation of clonorhis sinensis,a liver fluke, Journal of the Medical Association of Formosa ; 35: 268 - 269.
3Kφie M Christensen No, nansen D 1976. Stereoscan studies of eggs freeswimming and penetrating miracidium and earlysperocysts of Fascicla hepat ica. Z parasitend 51 ; (1) :79-90.