| article html file updated | 7 February 2020 09:32 CET | Update | https://www.mdpi.com/1996-1073/9/6/425 |
| article html file updated | 5 May 2019 14:09 CEST | Update | - |
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| article html file updated | 28 June 2016 09:28 CEST | Update | - |
| article html file updated | 31 May 2016 13:48 CEST | Original file | - |
| article xml uploaded. | 31 May 2016 13:47 CEST | Original file | https://www.mdpi.com/1996-1073/9/6/425/xml |
| article pdf uploaded. | 31 May 2016 13:47 CEST | Version of Record | https://www.mdpi.com/1996-1073/9/6/425/pdf |
