51 | Add to Reading ListSource URL: www.ntg.nlLanguage: English - Date: 1997-09-30 20:29:20
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52 | Add to Reading ListSource URL: www.christof-escher.comLanguage: English - Date: 2012-01-24 04:13:09
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53 | Add to Reading ListSource URL: weg.platformwow.nlLanguage: Dutch - Date: 2012-02-27 07:09:00
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54 | Add to Reading ListSource URL: cdn.cgproprints.com- Date: 2015-05-04 12:26:01
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55 | Add to Reading ListSource URL: www.escherfoto.comLanguage: German - Date: 2015-04-12 02:36:08
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56 | Add to Reading ListSource URL: www.tekstentuning.nlLanguage: Dutch - Date: 2012-04-02 05:11:27
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57 | Add to Reading ListSource URL: www.o-phase.comLanguage: English - Date: 2015-02-26 06:58:18
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58 | Add to Reading ListSource URL: www.asiapacific-mathnews.comLanguage: English - Date: 2011-01-31 03:20:44
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59 | Add to Reading ListSource URL: research.microsoft.comLanguage: English - Date: 2013-04-09 20:33:37
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60 | Add to Reading ListSource URL: www.york.ac.ukLanguage: English - Date: 2007-03-19 06:07:29
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