TY  - RPRT
TI  - Gravity constraints in infant motor development.
AU  - R K Jensen
AU  - H Sun
AU  - T Treitz
AU  - H E Parker
PY  - 1997
DO  - 10.1080/00222899709603470
UR  - https://pubmed.ncbi.nlm.nih.gov/11540148/
ID  - 11540148
ER  -