@misc{indiciae5f43c7cc9c66,
  title = {Attentional effort modulated by task difficulty.},
  author = {D Urbach and H Spitzer},
  year = {1995},
  doi = {10.1016/0042-6989(94)00305-x},
  url = {https://pubmed.ncbi.nlm.nih.gov/7667929/},
  note = {Source identifier: 7667929}
}