The following information obtained from UNAVCO's online DOI system:
(https://www.unavco.org/data/doi/search/search.html)

Afar GPS Network - DARA-Afdera P.S.
Start: 25-Feb-2009
End: 27-Oct-2009
Calais, Eric, 2009, Afar GPS Network - DARA-Afdera P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5H41PH7