| article html file updated | 5 February 2020 13:02 CET | Update | https://www.mdpi.com/1422-8599/2006/6/M509 |
| article html file updated | 18 September 2019 19:51 CEST | Update | - |
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| article html file updated | 23 September 2017 09:27 CEST | Update | - |
| article xml uploaded. | 23 September 2017 09:25 CEST | Update | https://www.mdpi.com/1422-8599/2006/6/M509/xml |
| article xml uploaded. | 23 September 2017 09:25 CEST | Original file | - |
| article html file updated | 14 December 2016 11:04 CET | Original file | - |
