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

Ethiopia Tectonics GPS Network - NEGE-Negele P.S.
Start: 27-Feb-2012
End: 08-Mar-2020
Bendick, Rebecca, 2013, Ethiopia Tectonics GPS Network - NEGE-Negele P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5B8562Z