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![Cover for Sherif El-Helaly · The Mathematics of Voting and Apportionment: An Introduction - Compact Textbooks in Mathematics (Paperback Book) [2019 edition] (2019)](https://imusic.b-cdn.net/images/item/original/679/9783030147679.jpg?sherif-el-helaly-2019-the-mathematics-of-voting-and-apportionment-an-introduction-compact-textbooks-in-mathematics-paperback-book&class=scaled&v=1615229236)