TY  - RPRT
TI  - An automatic bubble flow meter.
AU  - H R ULFENDAHL
AU  - I VOGELER
DO  - 10.1111/j.1748-1716.1962.tb02442.x
UR  - https://pubmed.ncbi.nlm.nih.gov/13923670/
ID  - 13923670
ER  -