TY  - RPRT
TI  - The first-born child: toddlers' problems.
AU  - M K Ounsted
AU  - C D Simons
PY  - 1978
DO  - 10.1111/j.1469-8749.1978.tb15301.x
UR  - https://pubmed.ncbi.nlm.nih.gov/729923/
ID  - 729923
ER  -