@misc{indiciaec864f369ed73,
  title = {Variable/Multispeed Rotorcraft Drive System Concepts},
  author = {Stevens, Mark A. and Handschuh, Robert F. and Lewicki, David G.},
  year = {2009},
  url = {https://ntrs.nasa.gov/citations/20090019132},
  note = {Source identifier: 20090019132}
}