TY  - RPRT
TI  - Studies on Castle's extrinsic factor.
AU  - R GORDIN
PY  - 1951
DO  - 10.1111/j.0954-6820.1951.tb10172.x
UR  - https://pubmed.ncbi.nlm.nih.gov/14856637/
ID  - 14856637
ER  -