@misc{indiciaebbd0670cad0a,
  title = {Large scale prop-fan structural design study. Volume 1: Initial concepts},
  author = {Billman, L. C. and Gruska, C. J. and Ladden, R. M. and Leishman, D. K. and Turnberg, J. E.},
  year = {1988},
  url = {https://ntrs.nasa.gov/citations/19900000727},
  note = {Source identifier: 19900000727}
}