@misc{indiciae275860800843,
  title = {Open environments to support systems engineering tool integration: A study using the Portable Common Tool Environment (PCTE)},
  author = {Eckhardt, Dave E., Jr. and Jipping, Michael J. and Wild, Chris J. and Zeil, Steven J. and Roberts, Cathy C.},
  year = {1993},
  url = {https://ntrs.nasa.gov/citations/19940011013},
  note = {Source identifier: 19940011013}
}