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Beck, Thomas; Feller, Urs (1991). Ammonium-stimulated potassium release from Lemna minor L. grown on a medium containing nitrate as N-source. Aquatic botany, 39(3-4), pp. 255-266. Elsevier 10.1016/0304-3770(91)90003-N
Steinmann, Fritz; Brändle, Roland (1984). Carbohydrate and protein metabolism in the rhizomes of the bulrush (Schoenoplectus lacustris (L.) Palla) in relation to natural development of the whole plant. Aquatic botany, 19(1-2), pp. 53-63. Elsevier 10.1016/0304-3770(84)90007-X
