Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) ARAO Shinji and KUSUDA Tetsuya,FORMULA ON ENERGY LOSSES AT TWO-WAY CIRCULAR DROP MANHOLE,Doboku Gakkai Ronbunshuu G,1880-6082,Japan Society of Civil Engineers,2006,62,1,162-170,https://cir.nii.ac.jp/crid/1390282680232489472,https://doi.org/10.2208/jscejg.62.162