TY  - RPRT
TI  - Undefined high-power fields.
AU  - I A Cree
AU  - A J Foss
AU  - P J Luthert
PY  - 1996
DO  - 10.1016/s0140-6736(96)90455-9
UR  - https://pubmed.ncbi.nlm.nih.gov/8551926/
ID  - 8551926
ER  -