TY  - RPRT
TI  - The normal crying curve: what do we really know?
AU  - R G Barr
PY  - 1990
DO  - 10.1111/j.1469-8749.1990.tb16949.x
UR  - https://pubmed.ncbi.nlm.nih.gov/2332126/
ID  - 2332126
ER  -