@misc{indiciae34299f9ab554,
  title = {Structured Course Objects in a Digital Library},
  author = {Maly, K. and Zubair, M. and Liu, X. and Nelson, M. and Zeil, S.},
  year = {1999},
  url = {https://ntrs.nasa.gov/citations/20040086501},
  note = {Source identifier: 20040086501}
}