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Baris 26: === Tutoran === * [http://www.minmm.com/minc/show_classes.php?id=273 Min Multimedia] * [~~http~~https://web.archive.org/web/20010221115956/http://www.sungwh.freeserve.co.uk/sapienti/abacus01.htm Suan Pan] * [http://abacus.etherwork.net/ Abakus: Misteri Manik - sebuah Manual Abakus] Baris 32: * [http://sks23cu.net/TSA/ Abakus Stephenson™], oleh Steve Stephenson * [http://www.cut-the-knot.org/blue/Abacus.shtml Abakus dalam berbagai-bagai Sistem Angka] di laman web [[cut-the-knot]] * [http://www.tux.org/~bagleyd/abacus.html Aplet-aplet Java untuk abakus-abakus Cina, Jepun dan Rusia] {{Webarchive\|url=https://web.archive.org/web/20041009110126/http://www.tux.org/~bagleyd/abacus.html \|date=2004-10-09 }} * [http://www.research.ibm.com/atomic/nano/roomtemp.html Abakus berskala atom] * [http://www.ee.ryerson.ca/~elf/abacus/ Sejarah abakus dan lain-lain] * [~~http~~https://web.archive.org/web/~~20070930023908~~20060212072618/http://mathdl.maa.org/convergence/1/~~?pa=content&sa=viewDocument&nodeId=1187&bodyId=1328~~ Abakus Gerbert d'Aurillac yang menggunakan angka Hindu-Arab] di ~~[http://web.archive.org/web/20060212072618/http://mathdl.maa.org/convergence/1/ laman web Convergence]~~ [[Kategori:Mesin kira mekanik]]

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