Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) Ichii Koji and Kawano Mayumi,Ground motion observation for the health monitoring of retaining wall and earthfill ‐applicability and problems‐,BUTSURI-TANSA(Geophysical Exploration),09127984,The Society of Exploration Geophysicists of Japan,2015,68,2,101-117,https://cir.nii.ac.jp/crid/1390282681471895040,https://doi.org/10.3124/segj.68.101