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

Ethiopia Tectonics GPS Network - ROBE-Robe P.S.
Start: 29-Mar-2007
End: 25-Jan-2015
Bendick, Rebecca, Reilinger, Robert E., 2007, Ethiopia Tectonics GPS Network - ROBE-Robe P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5G15XSW