@misc{indiciaeefd69a027dac,
  title = {Internal friction and modulus in rocks at depth},
  author = {Tittmann, B. R. and Clark, V. A. and Anlberg, L.},
  year = {1980},
  url = {https://ntrs.nasa.gov/citations/19800010330},
  note = {Source identifier: 19800010330}
}