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

Arenal Volcano GPS Network - LOLA-Los Lagos P.S.
Start: 04-May-1995
End: 20-Jul-2007
Schwartz, Susan, 1995, Arenal Volcano GPS Network - LOLA-Los Lagos P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T59W0CKR