Allen, James S., An Improved Electron Multiplier Particle Counter, Review of Scientific Instruments, 1947, 18: 739, doi:10.1063/1.1740838
Heroux, L.; Hinteregger, H. E., Resistance Strip Magnetic Photomultiplier for the Extreme Ultraviolet, Review of Scientific Instruments, 1960, 31: 280, doi:10.1063/1.1716957