1. Ammon, R., 1928. Zur Permeabilität überlebender tierischer Membranen. Biochem. Zeitschr.,196, 441–464.
2. Artschwager, E., 1924. Studies on the potato tuber. Journ. of Agric. Res.27, 11, 809–835.
3. —, 1926. Anatomy of vegetative organs of the sugar beet. Journ. of Agric. Res.33, 2, 143–176.
4. Artschwager, E., 1927. Wound peridem formation in potato. Journ. of Agric. Res.35, 995–1000.
5. Bennett, J. P., Anderssen, F. G., Milad, Y., 1927. Methods of obtaining tracheal sap from woody plants. New Phyt.26, 316–323.