1. Studies on the growth hormones of plants IV. Further experiments on the production of growth substances in root tips;Nagao;Science reports of the Tohoku Imperial Univ., Fourth series Biology,1938
2. Induction of polarity by geotropical stimulation in tomato plants lacking growth substance owing to being kept in the dark;Oortwijn Botjes;Proc. Akad. Wetenschap. Amsterdam, Sec. Sci.,1938
3. Wuchsstoff, Lichtwachstumsreaktion und Phototropismus bei Raphanus;Overbeek;Recueil Trav. Bot. Neerland,1933
4. Auxin distribution in seedlings and its bearing on the problem of bud inhibition;Oortwijn Botjes;Bot. Gaz.,1938
5. Auxin in isolated roots growing in vitro;Overbeek;Proc. Nat. Acad. Sci. U. S. A.,1938