@misc{indiciae3e18ac1eb9c2,
  title = {Necessary conditions for joining optimal singular and nonsingular subarcs},
  author = {Mc Daniel, J. P. and Powers, W. F.},
  year = {1970},
  url = {https://ntrs.nasa.gov/citations/19710001931},
  note = {Source identifier: 19710001931}
}