TY  - RPRT
TI  - Observations on the Harvard step test.
AU  - E N KEEN
AU  - A W SLOAN
PY  - 1958
DO  - 10.1152/jappl.1958.13.2.241
UR  - https://pubmed.ncbi.nlm.nih.gov/13575336/
ID  - 13575336
ER  -