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

CVO GPS Network - TSEP-September Lobe P.S.
Start: 04-Aug-2012
End: 14-Feb-2017
Lisowski, Michael, 2013, CVO GPS Network - TSEP-September Lobe P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5K935NX