SIMBAD references

ND₂H has been detected for the first time in the dense core of L134N, at the peak ammonia position. The abundance ratio [ND₂H]/[NH₂D] is 0.05, a slightly smaller value than the deuterium fractionation observed for ammonia [NH₂D]/[NH₃]∼0.1 (Tine et al., 2000, A&A, submit.). This is the second doubly deuterated species detected so far in the interstellar medium, and the first one in a cold dense core. The chemical processes leading to the formation of a significant amount of doubly deuterated ammonia ND₂H need to be thorougly investigated.