FURTHER STUDIES ON THE 21 % THICK , SUPERCRITICAL NLF AIRFOIL NAE 68-060-21 : 1 by

@inproceedings{JFErckenbrechtMFURTHERSO,
  title={FURTHER STUDIES ON THE 21 % THICK , SUPERCRITICAL NLF AIRFOIL NAE 68-060-21 : 1 by},
  author={D. J.F.ErckenbrechtM.}
}