TY  - RPRT
TI  - Two plus two.
AU  - D Ledrick
AU  - W T Kuhn
PY  - 2000
DO  - 10.1111/j.1553-2712.2000.tb00487.x
UR  - https://pubmed.ncbi.nlm.nih.gov/11073491/
ID  - 11073491
ER  -