Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) TANAKA T.,A case study on piping during excavation for bridge abutments,"Proc. Int. Symp. on Underground Construction in Soft Ground, 1994",,,1994,,,159-162,https://cir.nii.ac.jp/crid/1570854176721340160,