TY  - RPRT
TI  - Testing twin means and estimating genetic variance: basic methodology for the analysis of quantitative twin data.
AU  - J C Christian
PY  - 1979
DO  - 10.1017/s0001566000009314
UR  - https://pubmed.ncbi.nlm.nih.gov/397708/
ID  - 397708
ER  -