I do recall that in a bizarre twist of power politics the UK and I suspect others provided SOF trainers to the insurgents, notably in the use of mines. Using facilities in Thailand or just across the border. So maybe the de-mining campaign groups are a starting point?

Slightly hazy now, is there material in the pre-UN deployment situation? Reports on what had happened after 1978. So checking UN and peacekeeping websites / institutes might help, notably in Australia and Canada (Lester Pearson Centre).