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

Afar GPS Network - DASA-Saha P.S.
Start: 17-Jan-2008
End: 19-Feb-2009
Calais, Eric, 2008, Afar GPS Network - DASA-Saha P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5CC0XR2