TY  - RPRT
TI  - [A1 and A2 blood group substances: are there structural differences?].
AU  - R Hauser
AU  - G Fechner
AU  - B Brinkmann
PY  - 1990
DO  - 10.1007/bf01261423
UR  - https://pubmed.ncbi.nlm.nih.gov/2264401/
ID  - 2264401
ER  -