@misc{indiciaec77ce801e309,
  title = {Age differences in performance at concentration: a pilot study.},
  author = {J Chagnon and S J McKelvie},
  year = {1992},
  doi = {10.2466/pms.1992.74.2.412},
  url = {https://pubmed.ncbi.nlm.nih.gov/1594400/},
  note = {Source identifier: 1594400}
}