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

MAGNET - GVG7-GVG7 P.S.
Start: 27-Jan-2011
End: 23-Feb-2011
Blewitt, Geoff, Hammond, William C., Kreemer, Corne, 2011, MAGNET - GVG7-GVG7 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5668BBD