Author,Title,Journal,ISSN,Publisher,Date,Volume,Number,Page,URL,URL(DOI) MATSUMOTO Osamu and TANI Kazuo,Fast Passing Over Steps Whose Height is Unknown by a 'Variable Structure Type Four-Wheeled Robot'.,TRANSACTIONS OF THE JAPAN SOCIETY OF MECHANICAL ENGINEERS Series C,03875024,The Japan Society of Mechanical Engineers,1997,63,616,4299-4306,https://cir.nii.ac.jp/crid/1390282681303597824,https://doi.org/10.1299/kikaic.63.4299