@misc{indiciae28db30427c7d,
  title = {Catalytic, hollow, refractory spheres},
  author = {Wang, Taylor G. and Elleman, Daniel D. and Lee, Mark C. and Kendall, Jr., James M.},
  year = {1987},
  url = {https://ntrs.nasa.gov/citations/20080007415},
  note = {Source identifier: 20080007415}
}