| article html file updated | 8 February 2020 22:03 CET | Update | https://www.mdpi.com/2073-4360/9/12/639 |
| article html file updated | 28 September 2019 17:08 CEST | Update | - |
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| article html file updated | 2 January 2018 14:28 CET | Update | - |
| article html file updated | 23 November 2017 12:27 CET | Original file | - |
| article xml uploaded. | 23 November 2017 12:26 CET | Original file | https://www.mdpi.com/2073-4360/9/12/639/xml |
| article pdf uploaded. | 23 November 2017 12:26 CET | Version of Record | https://www.mdpi.com/2073-4360/9/12/639/pdf |
