1. J.L. van Leeuwen, D.R.V. van Delft Static test until failure of rotor blade and blade foot of the WPS-30 wind turbine (written in Dutch). Stevin report 6-86-10, Delft Univ. of Tech. (Draft)
2. B. Roorda, P.P. Soullié GAPHAT-Globaal analyse programma voor horizontale as windturbines, versie 841111. (written in Dutch) ECN report 85-054
3. D.R.V. van Delft, J.L. van Leeuwen The fatigue test on the rotor blade, blade foot and hub section of the WPS-30 wind turbine. (written in Dutch) Stevin report, Delft Univ. of Tech. (Draft)