Tobias Boner: Deferral - High-Volume Decentralized Blockchain-Based Referral Systems; Universität Zürich, Communication Systems Group, Department of Informatics, Zürich, Switzerland, May 2023, URL: https://owncloud.csg.uzh.ch/index.php/s/77TATExxwCawcZi/download/ma-tobias-boner.pdf.