@misc{indiciae277a4d622fb6,
  title = {Instability in a sand heap.},
  author = {P Evesque and J Rajchenbach},
  year = {1989},
  doi = {10.1103/physrevlett.62.44},
  url = {https://pubmed.ncbi.nlm.nih.gov/10039544/},
  note = {Source identifier: 10039544}
}