| article html file updated | 5 February 2020 20:39 CET | Update | https://www.mdpi.com/2076-3417/2/2/549 |
| article html file updated | 8 May 2019 17:39 CEST | Update | N/A |
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| article html file updated | 17 June 2015 00:16 CEST | Update | N/A |
| article html file updated | 7 February 2013 12:39 CET | Update | N/A |
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| article html file updated | 29 January 2013 04:09 CET | Update | N/A |
| article html file updated | 26 January 2013 10:56 CET | Update | N/A |
| article html file updated | 23 January 2013 19:03 CET | Original file | N/A |
