1. A.P.M. den Nijs and J.B.M. Custers. Introducing resistances into the cucumber by interspecific hybridization, in: D.M. Bates (Ed.). The Biology and Chemistry of the Cucurbitaceae, Cornell University Press, Itaca, New York, 1987, in press.
2. T. Murashige and F. Skoog. Physiol. Plant. 15 (1962) 473.
3. A.M. Frearson, J.B. Power and E.C. Cocking. Develop. Biol. 33 (1973) 130
4. R.D. Shillito, J. Paszkowski and I. Potrykus. Plant Cell Reports 2 (1983) 244.
5. J.J.M. Dons and R. Bouwer. Improving the culture of cucumber protoplasts by using an agarose-disc procedure, in: Nuclear techniques and in vitro culture for plant improvement, International atomic energy agency, Vienna, 1985, p. 497.