1. Untersuchungen über Wirkung und Wanderung des Wuchsstoffes in der Wurzel;Amlong;Jahrb. wiss. Botan.,1939
2. A comparative study on the recovery of the geotropic response of decapitated Avena coleoptiles by indoleacetic acid, indoleacetonitrile and naphthylacetic acid;Anker;Koninkl. Ned. Akad. Wetenschap., Proc.,1954
3. The auxin concentration rule for the geotropism of Avena coleoptiles;Anker;Acta Botan. Neerl.,1956
4. On a geo-growth reaction of the Avena coleoptile;Anker;Acta Botan. Neerl.,1960
5. Ortho-geotropism in shoots and coleoptiles;Anker,1962