@misc{indiciaebe54a289bd34,
  title = {Learning set with intra-problem stimulus variation.},
  author = {M Goldstein and R J Weber},
  year = {1965},
  doi = {10.2466/pms.1965.21.3.799},
  url = {https://pubmed.ncbi.nlm.nih.gov/5855922/},
  note = {Source identifier: 5855922}
}