TY  - RPRT
TI  - Fluorescent indicators of ion concentrations.
AU  - R Y Tsien
PY  - 1989
DO  - 10.1016/s0091-679x(08)60978-4
UR  - https://pubmed.ncbi.nlm.nih.gov/2538708/
ID  - 2538708
ER  -