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Terpstra, W. (1953). Chromatographic identification of the growth substance 

 extracted from Avena coleoptile tips. Proc. K. Ned. Akad. Wetensch. Ser.C,56, 206. 



WiLDMAN, S. G., and Bonner, J. (1948). Observations on the chemical nature and 

 formation of auxin in the Avena coleoptile. Amer. J. Bot. 35, 740. 



Yamaki, T., and Nakamura, K. (1952). Formation of indoleacetic acid in maize 

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