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

Ethiopia Tectonics GPS Network - ASOS-Assosa P.S.
Start: 02-Feb-2012
End: 29-Jan-2017
Bendick, Rebecca, 2013, Ethiopia Tectonics GPS Network - ASOS-Assosa P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T55H7D6V