@misc{indiciae486ec66b0789,
  title = {Essentials of problem-based learning.},
  author = {H J Walton and M B Matthews},
  year = {1989},
  doi = {10.1111/j.1365-2923.1989.tb01581.x},
  url = {https://pubmed.ncbi.nlm.nih.gov/2593886/},
  note = {Source identifier: 2593886}
}