Namkung, Ju. Phonological Inventories of Tibeto-Burman Languages. 1996. hh:hld:Namkung:Tibeto-Burman
Since laryngealization can't co-occur with high tone, it's analyzed here as a feature of the tonal system.
Initial voiceless consonants are aspirated in non-laryngealized syllables and unaspirated in laryngealized ones, so it's unclear whether they're phonemic.