TY  - RPRT
TI  - When to avoid creating surplus human embryos.
AU  - J D Biggers
AU  - M C Summers
PY  - 2004
DO  - 10.1093/humrep/deh476
UR  - https://pubmed.ncbi.nlm.nih.gov/15319382/
ID  - 15319382
ER  -