41. Infao5501.ag5.mpi-sb.mpg.de8080 Invalid link! http://infao5501.ag5.mpi-sb.mpg.de:8080/topx/archive?link=Wikipedia-Lip6-2/26222

42. Tsu Chung-Chi (cratere) - WikipediaTranslate This PageIl Cratere Tsu Chung-Chi U 75 Ptolemy c.85c.165 Nicomachus of Gerasa C.100 Theon of Smyrna c. 125 Diophantus Ist or 3 rd century Pappus c.320 Iamblichus c.325 Proclus 410-485 Tsu Ch'ung-Chi 430-501 http://it.wikipedia.org/wiki/Tsu_Chung-Chi_(cratere)

43. Pi-Day 2004 Squaring The Circle On Pi-Day found by Tsu Chung Chi (450). http://www.piworld.de/piday04/squar05.html

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