TY  - RPRT
TI  - An inexpensive level detector.
AU  - M E Swinnen
PY  - 1967
DO  - 10.1111/j.1469-8986.1967.tb02713.x
UR  - https://pubmed.ncbi.nlm.nih.gov/6038678/
ID  - 6038678
ER  -