Le chant des harmoniques, documentary

From time to time my search for music stuff is rewarded with this kind of material. This excellent French documentary, called Le Chant des harmoniques (1989) (In French) features the ethnomusicologist Tran Quang Hai who is teaching khoomii to his students, shows spectral and radiological images of the throat taken at the moment of khoomii singing (this research was lost due to a technical incident), interviews with Ganbold and Yavgaan, and shows overtone singing from Rajastan, South Africa, etc.