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

CICESE REGNOM GPS Network - IAGX-iagxREGNOMmx2018 P.S.
Start: 09-Mar-2018
End: 18-Mar-2020
Gonzalez-Ortega, Alejandro, Galetzka, John E., Gonzalez, Javier, 2018, CICESE REGNOM GPS Network - IAGX-iagxREGNOMmx2018 P.S., UNAVCO, GPS/GNSS Observations Dataset, 
https://doi.org/10.7283/DGWN-A627