Gourine, Bachir, Sofiane Khelifa, Kamel Hasni, and Farida Bachir Belmehdi. 2021. “Geocenter Variations Assessment Using Frequency Analysis and Allan Variance Method”. Anuário Do Instituto De Geociências 44 (September). Rio de Janeiro, BR. https://doi.org/10.11137/1982-3908_2021_44_38077.