TY  - RPRT
TI  - Individual differences in perceived exertion assessed by two new methods.
AU  - L E Marks
AU  - G Borg
AU  - G Ljunggren
PY  - 1983
DO  - 10.3758/bf03202957
UR  - https://pubmed.ncbi.nlm.nih.gov/6646971/
ID  - 6646971
ER  -