Text ( visual ) : unmediated Partially ordered groups / A.M.W. Glass. -- Singapore : World Scientific , c1999. -- xiii, 307 p. ; 23 cm. -- (Series in algebra ; vol. 7). -- Includes bibliographical references and index. -- ISBN 9810234937 ; (BA4284858X) ; https://ci.nii.ac.jp/ncid/BA4284858X Author Heading(s): Glass, A. M. W. (Andrew Martin William). -- Classification(s): LCC : QA171.485 ; DC21 : 511.3/2. -- Subject Heading(s): LCSH : Partially ordered sets