著者名,論文名,雑誌名,ISSN,出版者名,出版日付,巻,号,ページ,URL,URL(DOI) Martin Edjvet and James Howie,The solution of length four equations over groups,Transactions of the American Mathematical Society,0002-9947,American Mathematical Society (AMS),1991,326,1,345-369,https://cir.nii.ac.jp/crid/1363670320119481856,https://doi.org/10.1090/s0002-9947-1991-1002920-5