TY  - RPRT
TI  - On the length-difficulty relation in skill performance.
AU  - J Swink
AU  - D Trumbo
AU  - M Noble
PY  - 1967
DO  - 10.1037/h0024705
UR  - https://pubmed.ncbi.nlm.nih.gov/6052613/
ID  - 6052613
ER  -