1. Schilperoort, R.A., Klapwijk, P.M., Ooms, G. and Wullems, G.J. (1980). In: Genetic Origins of Tumor Cells. Cleton, F.J. and Simons, J.W.F.M. (eds.) pp.87–108. M. Nijhoff. The Hague.
2. Márton, L., Wullems, G.J., Molendijk, L. and Schilperoort, R.A.(1979). Nature 277:129–131.
3. Krens, F.A., Wullems, G.J. and Schilperoort, R.A.(1983). In: Proceedings of the NATO Advanced Studies Institute and FEBS Advanced Course on Structure and Function of Plant Genomes. Ciferri, O.(ed.) pp.387–408. Plenum Press. London.
4. Krens, F.A., Molendijk, L., Wullems, G.J. and Schilperoort, R.A. (1982). Nature 296:72–74.
5. Krens, F.A. and Schilperoort, R.A.(1983). In: Cell Culture and Somatic Cell Genetics of Plants. Vasil, I.K.(ed.) Academic Press. New York, in press.