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

Plutons GPS Network - SOCM-Socompa P.S.
Start: 12-Nov-2011
End: 02-Dec-2021
Pritchard, Matt, 2012, Plutons GPS Network - SOCM-Socompa P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5TT4P27