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"Archived copy"(PDF). www.math.caltech.edu. Archived from the original(PDF) on 23 March 2012. Retrieved 9 August 2022.{{cite web}}: CS1 maint: archived copy as title (link)
"Archived copy"(PDF). www.math.caltech.edu. Archived from the original(PDF) on 23 March 2012. Retrieved 9 August 2022.{{cite web}}: CS1 maint: archived copy as title (link)