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

SAGE New Zealand GPS Network - HORN-Hoophorn Spur P.S.
Start: 29-Nov-2006
End: 14-Nov-2022
Hager, Bradford H., Herring, Thomas A., Molnar, Peter, 2003, SAGE New Zealand GPS Network - HORN-Hoophorn Spur P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5NP22P5