1. Fadl, M. S., Griogs, V. M., Haxsex, C. J.: Propagation of own rooted Old Homo and Bartlett pears to produce treos resistant to pear decline. — Proc. amor. Soo. hort. Sci.82: 92–102, 1963.
2. Libby, W. J., Conkle, M. T.:Effects of auxin treatment, tree age, tree vigour and cold storage on rooting young Monterrey pine. — Forest. Soi.12: 484–502, 1966.
3. Filet, P. E., Debouohet, J.: Proposition d'un tost "Colooptile" (Triticum) pour le dosage auxinique. — Rev. gen. Bot.69: 545–562, 1962.
4. Reuveni, O., Adato, I.: Endogenous carbohydrates, root promoters, and root inhibitors in easy and difficult-to-root Date palm (Phoenix dactylifera L.) offshoots. — J. amer. Soc. hort. Sci.99: 361–363, 1974.
5. Timman, K. V., Koepfli, J. B.: Identity of growth promoting and root forming substances of plants. — Nature135: 101, 1935.