1. 4th Needle/Leaf Interlaboratory Test 1999/2000 ICP-Forests. December 2000;Bartels,1999
2. Arborist Equipment. A Guide to the Tools and Equipment of Tree Maintenance and Removal;Blair,1995
3. Dry ash, a better reference base than dry matter for heavy metals and other persistent pollutants;Claussen;Plant Soil,1990
4. Are eggshells and egg contents of great and blue tits suitable as indicators of heavy metal pollution?;Dauwe;Belg J Zool,1999
5. Using the SALIMAT technique to establish a willow vegetation cover on wet substrates;De Vos,1994