TY  - RPRT
TI  - STATISTICAL STUDY OF TWINS--METHODS.
AU  - A GITTELSOHN
AU  - S MILHAM
PY  - 1964
DO  - 10.2105/ajph.54.2.286
UR  - https://pubmed.ncbi.nlm.nih.gov/14115496/
ID  - 14115496
ER  -