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

Nepal GPS Network - SIMP-Simara P.S.
Start: 21-Dec-1996
End: 12-Sep-2000
Bilham, Roger G., 1998, Nepal GPS Network - SIMP-Simara P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5T72FRP