@phdthesis{oai:tsukuba.repo.nii.ac.jp:00011352, author = {保坂, 哲也 and Hosaka, Tetsuya}, month = {}, note = {2000, Includes bibliographical references}, school = {筑波大学, University of Tsukuba}, title = {Coxeter groups and their boundaries}, year = {2001} }