TY  - RPRT
TI  - Achieving qualification--a new proposal.
AU  - P Birchenall
PY  - 1997
DO  - 10.1016/s0260-6917(97)80093-7
UR  - https://pubmed.ncbi.nlm.nih.gov/9370624/
ID  - 9370624
ER  -