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

SuomiNet:G GPS Network - SG26-SNUGPS1 P.S.
Start: 10-Jan-2003
End: 05-Mar-2011
Lim, Gyu-Ho, 2003, SuomiNet-G GPS Network - SG26-SNUGPS1 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T50P0X54