@misc{indiciae7d42a93d5885,
  title = {Fixed Future and Uncertain Past: Theorems Explain Why It Is Often More Difficult to Reconstruct the Past Than to Predict the Future},
  author = {Alefeld, Goetz and Koshelev, Misha and Mayer, Guenter},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/20010000364},
  note = {Source identifier: 20010000364}
}