1. Ahkong, Q. F., I. I. Howell, J. A. Lucy, F. Safwat, M. R. Davey, andE. C. Cocking, 1975: Fusion of hen erythrocytes with yeast protoplasts induced by polyethylene glycol. Nature225, 66?67.
2. Bajaj, Y. P. S., 1976: Protoplast isolation, culture and somatic hybridization. In: Applied and fundamental aspects of plant cell, tissue, and organ culture (Reinert, J., andY. P. S. Bajaj, eds.), pp. 467?496. Berlin-Heidelberg-New York: Springer-Verlag.
3. Carlson, P. S., H. H. Smith, andR. D. Dearing, 1972: Parasexual interspecific plant hybridisation. Proc. nat. Acad. Sci. (USA)69, 2292?2294.
4. Cocking, E. C., andJ. F. Peberdy (eds.), 1974: The use of protoplasts from fungi and higher plants as genetic systems.?A practical handbook. Nottingham, University press.
5. Constabel, F., D. Dudits, O. L. Gamborg, andK. N. Kao, 1975 a: Nuclear fusion in intergeneric heterokaryons. A note. Canad J. Bot.53, 2092?2095.