@misc{indiciaefb20871999c7,
  title = {The Effect of Pulse Shaping QPSK on Bandwidth Efficiency},
  author = {Purba, Josua Bisuk Mubyarto and Horan, Shelia},
  year = {1997},
  url = {https://ntrs.nasa.gov/citations/19970025033},
  note = {Source identifier: 19970025033}
}