Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) ISHII A.,Operation system of a double-front work machine for simultaneous operation,"23rd Int. Symp. on Automation and Robotics in Construction, 2006",,,2006,,,539-542,https://cir.nii.ac.jp/crid/1574231875714448512,