@misc{indiciae191d25f5365f,
  title = {A robust calibration technique for acoustic emission systems based on momentum transfer from a ball drop},
  author = {Gregory C. McLaskey and David A. Lockner and Brian D. Kilgore and Nicholas M. Beeler},
  year = {2015},
  doi = {10.1785/0120140170},
  url = {https://pubs.usgs.gov/publication/70135195},
  note = {Source identifier: 70135195}
}