@misc{indiciaed97f953046e3,
  title = {Energy-Efficient, Continuous-Flow Ash Lockhopper},
  author = {Collins, Earl R., Jr. and Suitor, Jerry W. and Dubis, David},
  year = {1989},
  url = {https://ntrs.nasa.gov/citations/19890000316},
  note = {Source identifier: 19890000316}
}