@misc{indiciaec735ee9b24e7,
  title = {Proton Exchange Membrane (PEM) fuel Cell for Space Shuttle},
  author = {Hoffman, William C., III and Vasquez, Arturo and Lazaroff, Scott M. and Downey, Michael G.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20000102277},
  note = {Source identifier: 20000102277}
}