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The newly created International Gravity Reference Frame (IGRF) will heavily rely on widely distributed reference stations. It is required that at any time of the year the instantaneous value of gravity will be available at such reference stations. It can be achieved very precisely with the continuously operating superconducting gravimeters or approximately with the periodical absolute gravity measurements. Apparently, the measurement frequency should be determined for each station separately,doi:10.5281/zenodo.2836463 fatcat:gtribjl55rh7dcted7rhg3vedu