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

Azerbaijan cGPS Geodynamics Network - PIRS-Pirshagi P.S.
Start: 22-Apr-2015
End: 09-Mar-2022
Kadirov, Fakhraddin, Mammadov, Samir, Reilinger, Robert E., 2015, Azerbaijan cGPS Geodynamics Network - PIRS-Pirshagi P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/T5HM56TT