Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL "ηŽ‰δΊ•, ε“²ι›„ and Ito, Akito",Requirements and design change in large-scale software development : analysis from the viewpoint of precess backtrack,,University of Tsukuba,1992,Research report,,,,https://cir.nii.ac.jp/crid/1130000796378293760