I'm confused (not unusual). Do you want info on short courses for VDTs (ie, the ELF/VLF saw-tooth emissions?), or ELF (ie, the 60 Hz sinusoidal waves) in general, or both, or neither? If it is the former, it certainly would be a short course. Your best bet is a short course on non-ionizing radiation in gerneral, which includes a section on VDTs. For that, many are around.