851![](https://www.pdfsearch.io/img/51786928349089197701acd6146e6d60.jpg) | Add to Reading ListSource URL: unsolvedproblems.orgLanguage: English - Date: 2012-06-23 01:55:47
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852![](https://www.pdfsearch.io/img/7a04f6646d33a8d6f055aa5b6713c5b0.jpg) | Add to Reading ListSource URL: math.fullerton.eduLanguage: English - Date: 2004-02-12 08:05:16
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853![](https://www.pdfsearch.io/img/ec5a3a7fad1bc97ff3d57dd5fb336ef4.jpg) | Add to Reading ListSource URL: live.unece.orgLanguage: English |
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854![](https://www.pdfsearch.io/img/52e04096a9c8edc109992d2e47c60c3e.jpg) | Add to Reading ListSource URL: arxiv.orgLanguage: English - Date: 2011-06-16 20:01:17
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855![](https://www.pdfsearch.io/img/a9f476d4b33f3bac56505dfbfc8b4b3c.jpg) | Add to Reading ListSource URL: www.thewho.netLanguage: Hungarian |
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856![](https://www.pdfsearch.io/img/b1bf479e75cfb58ac01e0016c3261298.jpg) | Add to Reading ListSource URL: rsta.royalsocietypublishing.orgLanguage: English - Date: 2015-04-04 09:41:12
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857![](https://www.pdfsearch.io/img/fd4b5fc8c0fc471803468c9c6dfc3431.jpg) | Add to Reading ListSource URL: www.netl.doe.govLanguage: English - Date: 2013-07-10 18:14:29
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