Cannell, M B A photomultiplier tube assembly for the detection of low light levels. [electronic resource] - Pflugers Archiv : European journal of physiology Jul 1983 - 165-8 p. digital Publication Type: Journal Article ISSN: 0031-6768 Standard No.: 10.1007/BF00581066 doi Subjects--Topical Terms: Adenosine Triphosphate--analysisCalcium--analysisLightLuminescent ProteinsPhotometry--instrumentation