2003, Article in monograph or in proceedings (Wolff, W.J.; Essink, K.; Kellermann, A. (ed.), Challenges to the Wadden Sea: proceedings of the tenth [10th] International Scientific Wadden Sea Symposium, pp. 173-197)
2011, Article in monograph or in proceedings (Wisdom, R.; Vohla, C. (ed.), After Wise Use – The Future of Peatlands, Proceedings of the 13th International Peat Congress: Pristine Mire Landscapes, pp. 92-94)