著者名,書名,版表示,出版者名,出版年,シリーズ名,番号,ISBN,ISSN,URL
"Levi, Decio and Olver, Peter J. and Thomova, Zora and Winternitz, Pavel",Symmetries and integrability of difference equations,,Cambridge University Press,2011,London Mathematical Society lecture note series,,9780521136587,,https://cir.nii.ac.jp/crid/1130000796440616576