Author,Title,Edition,Publisher,Year,Series,Number,ISBN,ISSN,URL "Shevrin, L. N. and Ovsyannikov, A. J. (Alexander J.)",Semigroups and their subsemigroup lattices,,Kluwer,1996,Mathematics and its applications,,0792342216,,https://cir.nii.ac.jp/crid/1130000794606839168