TY  - RPRT
TI  - Are "passive" extension exercises really passive?
AU  - I Fiebert
AU  - C D Keller
PY  - 1994
DO  - 10.2519/jospt.1994.19.2.111
UR  - https://pubmed.ncbi.nlm.nih.gov/8148864/
ID  - 8148864
ER  -