| article html file updated | 5 February 2020 11:16 CET | Update | https://www.mdpi.com/1422-0067/9/11/2159 |
| article html file updated | 9 May 2019 13:24 CEST | Update | - |
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| article html file updated | 16 June 2015 05:04 CEST | Update | - |
| article html file updated | 9 March 2015 06:40 CET | Update | - |
| article xml file uploaded | 9 March 2015 06:40 CET | Original file | https://www.mdpi.com/1422-0067/9/11/2159/xml |
| article html file updated | 6 February 2013 14:12 CET | Update | - |
| article html file updated | 5 February 2013 18:00 CET | Update | - |
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| article html file updated | 18 January 2013 19:59 CET | Update | - |
| article html file updated | 17 January 2013 18:31 CET | Original file | - |
