TY  - RPRT
TI  - Crossing the threshold.
AU  - P Ingham
AU  - J Smith
PY  - 1992
DO  - 10.1016/0960-9822(92)90656-u
UR  - https://pubmed.ncbi.nlm.nih.gov/15335894/
ID  - 15335894
ER  -