1. Allis, C.D., Waring, G.L., Mahowald, A.P.: Mass isolation of pole cells from Drosophila melanogaster. Develop. Biol. 56, 372–381 (1977)
2. Chan, L.N., Gehring, W.: Determination of blastoderm cells in Drosophila melanogaster. Proc. nat. Acad. Sci. (Wash.) 68, 2217–2221 (1971)
3. Counce, S.J.: The causal analysis of insect embryogenesis. In: Developmental systems: Insects (ed. S.J. Counce, C.H. Waddington), Vol. 2, pp. 1–156. London: Academic Press 1973
4. Deusen, E.B. van: Sex determination in germ line chimaeras of Drosophila melanogaster. J. Embryol. exp. Morph. 37, 173–185 (1976)
5. Fielding, C.J.: Developmental genetics of the mutant grandchildless of Drosophila subobscura. J. Embryol. exp. Morph. 17, 375–384 (1967)