Håkansson & Wallgren 1972a
Aus Offene Naturführer
Håkansson, S. & Wallgren, B. 1972: Experiments with Sonchus arvensis L. III. The development from reproductive root cut into different length and planted at different depths, with and without competition from barley. In: Swed. J. agric. Res. Bd. 2, S. 3–14.
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