1. Arya, H. C., Hildebbandt, A. C., Riker, A. J.: Clonal variation of grape-stem andPhylloxeragall callus growingin vitro in different concentrations of sugars.- Amer. J. Bot.49: 368 to 372, 1962.
2. Cocking, E. C.: Ultrastructure of cultured cells.- In:Robards, A. W. (ed): Dynamic Aspects of Plant Ultrastructure. Pp. 310–330. McGraw-Hill Book Company (UK) Limited, Maidenhead- Berkshire-England 1974.
3. Erdelský, K.: “Paper technique” of cultivating callus tissue in Erlenmeyer flask.- Acta fac. rer. nat. Univ. Comen.- Physiol. Plant.5: 107–120, 1972.
4. Gifford, E. M., Hewitt, W. B.: The use of heat therapy andin vitro shoot tip culture to eliminate fanleaf virus from the grapevine.- Amer. J. Enol. Viticult.12: 129–130, 1961.
5. Gresshoff, P. M., Doy, C. H.: Derivation of haploid cell line fromVitis vinifera and the importance of the stage of meiotic development of antheis for haploid culture of the other genera. - Z. Pflanzenphysiol.73: 132–141, 1974.