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

British Antarctic Survey GPS Network - ROTB-Rothera P.S.
Start: 24-Feb-1999
End: 01-Mar-2011
King, Matt, King, Edward, 2013, British Antarctic Survey GPS Network - ROTB-Rothera P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T56M34Z7