Reference
Luit J. De Kok, Sue Westermann, C. E. E. Stuiver, Wilfried Weidner, Ineke Stulen, Dieter Grill (2002): Interaction between Atmosperic Hydrogen Sulfide Deposition and Pedospheric Sulfate Nutrition in Brassica oleracea L. – Phyton, Annales Rei Botanicae, Horn – 42_3: 35 - 44.