1. Ameijden, U. P. van: Geotropism and phototropism in the absence of free oxygen. Rec. Trav. bot. néerl.14, 149–214 (1917).
2. Anker, L.: A comparative study on the recovery of the geotropic response of decapitated Avena coleoptiles by indoleacetic acid, indoleacetonitrile, and naphtylacetic acid. Proc. kon. ned. Akad. Wet. C57, 304–316 (1954).
3. —: The auxin concentration rule for the geotropism of Avena coleoptiles. Acta bot. neerl.5, 335–341 (1956).
4. Audus, L. J., andM. E. Brownbridge: Studies on the geotropism of roots. I. Growthrate distribution during response and the effects of applied auxins. J. exp. Bot.8, 105–124 (1957).
5. Bělehrádek, J.: Temperature and living matter. Protoplasma Monogr.8 (1935).