@misc{1192631,
  author = {William D Kovacs and Lawrence A salamone and Felix Y Yokel},
  title = {Energy measurement in the standard penetration test:},
  year = {1981},
  month = {1981-01-01 05:01:00},
  publisher = {Building Science Series, National Institute of Standards and Technology, Gaithersburg, MD},
  doi = {https://doi.org/10.6028/NBS.BSS.135},
  language = {en},
}