1. Garrad Hassan and Partners Ltd, Bristol BS2 0 QD, England
2. Wind Energy Department, Risø National Laboratory, 4000 Roskilde, Denmark
3. The Robert Gordon University, School of Mechanical and Offshore Engineering, Aberdeen AB10 1FR, Scotland
4. Dept. of Energy and Semiconductor Research EHF, University of Oldenburg, D-26111 Oldenburg, Germany
5. Gerard Schepers and Terry Hegberg, Energy Research Centre of the Netherlands, Wind Energy, 1755 ZG Petten, The Netherlands