The species description is indeed published. The authors are WOLFGANG BÖHME, THOMAS SCHÖTTLER, NGUYEN QUANG TRUONG and JÖRN KÖHLER.
It's an interesting article. It summarises the different locations where the species is found in Vietnam. These are the north-east provinces Bac Giang (type locality)and Cao Bang Province, and the province in central Vietnam, Nghe An.
Further there are interesting morphological characteristics and an x-ray of an animal, on which you can see the skull without the little points that Echinotriton have.
If you want the pdf sent me a pm and I'll sent it to you.