http://www.youtube.com/watch?v=bE2EiI-UfsE&feature=related
http://www.youtube.com/watch?v=U2bAlIK4KkE&feature=related
http://www.youtube.com/watch?v=suiDK61jAc8&NR=1
http://www.youtube.com/watch?v=3sERcM9o25g&feature=related
http://www.youtube.com/watch?v=lfBHLffM1Gg&feature=related
http://en.wikipedia.org/wiki/Golden_ratio
http://en.wikipedia.org/wiki/Fibonacci_number
http://tusach.thuvienkhoahoc.com/wiki/%C3%9D_ngh%C4%A9a_nh%E1%BB%AFng_h%C3%ACnh_v%E1%BA%BD_tr%C3%AAn_b%E1%BB%81_m%E1%BA%B7t_tr%E1%BB%91ng_%C4%91%E1%BB%93ng_Ng%E1%BB%8Dc_L%C5%A9
http://www.world-mysteries.com/sci_17.htm
http://my.opera.com/ductruong2491/blog/show.dml/4425323
http://emptyeasel.com/2009/01/20/a-guide-to-the-golden-ratio-aka-golden-section-or-golden-mean-for-artists/
http://goldenratio.wikidot.com/golden-ratio-from-renaissance-to-xvii-century
http://mrsvesseymathematicians.wikispaces.com/da+Vinci
http://beautifulproportion.blogspot.com/2009_08_01_archive.html
http://www.marcus-frings.de/text-nnj.htm
http://nelsoncaban.blogspot.com/2010/01/measuring-up.html
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