Reference procedure to establish fatigue stresses for large size wind turbines : a state of the art report / H.J. van GrolReference procedure to establish fatigue stresses for large size wind turbines : a state of the art report / H.J. van Grol, B.H. Bulder (ed.) ; participants: J.T. Petersen ... [et al.]Reference procedure to establish fatigue stresses for large size wind turbines : a state of the art report / H.J. van Grol