@misc{indiciae161579c8707f,
  title = {Precursors to failure in rocks while undergoing anelastic deformations},
  author = {Sobolev, G. and Salov, B. and Spetzler, H.},
  year = {1978},
  url = {https://ntrs.nasa.gov/citations/19780050596},
  note = {Source identifier: 19780050596}
}