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Aziz, Haris; Lee, Barton E. (2019-08-09). "The expanding approvals rule: improving proportional representation and monotonicity". Social Choice and Welfare. 54 (1). Springer Science and Business Media LLC: 8. arXiv:1708.07580. doi:10.1007/s00355-019-01208-3. ISSN0176-1714. S2CID46926459.
Aziz, Haris; Lee, Barton E. (2019-08-09). "The expanding approvals rule: improving proportional representation and monotonicity". Social Choice and Welfare. 54 (1). Springer Science and Business Media LLC: 8. arXiv:1708.07580. doi:10.1007/s00355-019-01208-3. ISSN0176-1714. S2CID46926459.