Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Tsubokawa Tsuneya,History and Current Status on the Development of the Absolute Gravimeter,Journal of the Geodetic Society of Japan,00380830,The Geodetic Society of Japan,2004,50,4,281-294,https://cir.nii.ac.jp/crid/1390282679043551744,https://doi.org/10.11366/sokuchi1954.50.281