Reference
Sue Westermann, Mechteld M. A. Blake-Kalaff, Luit J. De Kok, Ineke Stulen (2001): Sulfate Uptake and Utilization by Two Varieties of Brassica oleracea with Different Sulfure Need as Affected by Atmospheric H2S. – Phyton, Annales Rei Botanicae, Horn – 41_1: 49 - 61.