1. Prospects tar offshore wind energy:The state of the alt and future opportunities;Barthelmie;Wind Eng.,1993
2. Winklimaat van Nederland;Wieringa,1983
3. Climatological data of the Nedicrlands lightvessels over the period 1949–1980;Korevaar,1987
4. Climatological data for the North Sea based on observations by voluntary observing ships over the period 1961–1980;Korevaar,1989