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

Greenland GNSS Network - AASI-AASI P.S.
Start: 01-Jun-2007
End: 14-Jun-2008
Bevis, Michael, 2008, Greenland GNSS Network - AASI-AASI P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5TH8JRZ