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Willebrord Snellius Tham khảoLiên quan
Willebrord SnelliusTài liệu tham khảo
WikiPedia: Willebrord Snellius http://www.haverford.edu/physics/songs/snell.htm http://leiden.digitalestamboom.nl/(hylpyvfkxtrpov5... http://www.ncg.knaw.nl/Publicaties/Groen/pdf/14Haa... http://www.genealogy.ams.org/html/id.phtml?id=1253... http://www.dbnl.org/tekst/molh003nieu07_01/molh003... http://www-history.mcs.st-andrews.ac.uk/Biographie... http://books.google.co.uk/books?id=SQXcpvjcJBUC&lp... https://web.archive.org/web/20110718181424/http://... https://web.archive.org/web/20110722200119/http://...