1. Ackerson RC (1984) J Exp Bot 35(152):403
2. Boyer JS, Johnson RR, Saupe SG (1980) Agric J 72:981
3. Brenner ML, Hein MB, Schussler J, Daie J, Brun WA (1982) In: Wareing PF (ed) Plant growth substance 1982. Academic Press, New York, p 343
4. Brun WA, Brenner ML, Schussler J (1985) Br Plant Growth Regul Group Monograph 12:257
5. Eeuwens CJ, Schwabe PB (1975) J Exp Bot 26:1