Hill, Nathan W. 2009. Tibetan <h> as a plain initial and its place in Old Tibetan phonology. Linguistics of the Tibeto Burman Area 32. 115–140.
@article{jacquesestimative-hill09plain,
author = {Hill, Nathan W},
journal = {Linguistics of the Tibeto Burman Area},
number = {1},
pages = {115–140},
title = {Tibetan <h> as a plain initial and its place in Old Tibetan phonology},
volume = {32},
year = {2009}
}