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

Afar GPS Network - DAYR-Yirga Alita P.S.
Start: 24-Oct-2007
End: 18-Nov-2008
Calais, Eric, 2008, Afar GPS Network - DAYR-Yirga Alita P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5VD6WJX