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| url = https://www.ams.org/journals/ecgd/1998-02-06/S1088-4173-98-00032-0/S1088-4173-98-00032-0.pdf
| doi = 10.1090/S1088-4173-98-00032-0
| zbl = 0910.53005
}}
* {{Citation
| last = Sudbery
|