1. Burrows W J and Carr D J 1969 Effects of flooding root system of sunflower plants on the cytokinin content of the xylem sap. Physiol. Plant. 22, 1105–1112.
2. Carpenter W J, Beck C R and Anderson G A 1973 High intensity supplementary lighting during rooting of herbaceous cuttings. Hort. Science 8, 338–340.
3. Carpenter W J, Hansen E N and Carlson W H 1973 Medium temperature effect on geranium and poinsettia root initiation and elongation. J. Amer. Soc. Hort. Sci. 98, 64–66.
4. Currie J A 1960 Gaseous diffusion in phorous media. Part 1. A non-steady state method. Br. J. Appl. Phys. 11, 314–317.
5. Friis-Nielsen B and Mangle Pedersen A 1974 Dyrkingssubstraters indflydelse på planternes forsyning med vand og luft. Gartner Tidende 23, 348–349.