| article html file updated | 7 February 2020 20:41 CET | Update | https://www.mdpi.com/2072-6643/9/1/21 |
| article html file updated | 22 September 2019 17:20 CEST | Update | - |
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| article html file updated | 7 February 2017 12:20 CET | Update | - |
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| article xml uploaded. | 3 January 2017 08:55 CET | Original file | https://www.mdpi.com/2072-6643/9/1/21/xml |
| article pdf uploaded. | 3 January 2017 08:55 CET | Version of Record | https://www.mdpi.com/2072-6643/9/1/21/pdf |
