TY  - RPRT
TI  - Essentials of problem-based learning.
AU  - H J Walton
AU  - M B Matthews
PY  - 1989
DO  - 10.1111/j.1365-2923.1989.tb01581.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2593886/
ID  - 2593886
ER  -