1. Anker, L.: A comparative study on the recovery of the geotropic response of decapitated Avena coleoptiles by indole acetic acid, indole aceto nitrile and naphthyl acetic acid. Proc. kon. ned. Akad. Wet., Ser. C 57, 304–316 (1954).
2. Astruc, J.: Conjecture sur le redressement des plantes inclinées a l’horizon. Mém. Acad. roy. Sci. Paris 1708, 463–470 (1709).
3. Audus, L. J., and M. E. Brownbridge: Studies in the geotropism of roots. I. Growth-rate distribution during response and the effects of applied auxins. J. exp. Bot. 8, 105–124 (1957).
4. Bazin, G. A.: Observations sur les plantes et leur analogie avec les insectes. XVI + 134 pp. Strasbourg 1741.
5. Bennet-Clark, T. A., and N. G. Ball: The diageotropiç behaviour of rhizomes. J. exp. Bot. 2, 169–203 (1951).