@misc{indiciae949f4ff075b3,
  title = {A method for the objective study of tool-using behavior.},
  author = {R W Powell and W Kelly},
  year = {1975},
  doi = {10.1901/jeab.1975.24-249},
  url = {https://pubmed.ncbi.nlm.nih.gov/16811876/},
  note = {Source identifier: 16811876}
}