| article html file updated | 9 February 2020 05:03 CET | Update | https://www.mdpi.com/2077-1444/9/2/42 |
| article html file updated | 1 May 2019 22:02 CEST | Update | - |
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| article html file updated | 14 March 2018 15:13 CET | Update | - |
| article html file updated | 31 January 2018 15:27 CET | Original file | - |
| article xml uploaded. | 31 January 2018 15:26 CET | Original file | https://www.mdpi.com/2077-1444/9/2/42/xml |
| article pdf uploaded. | 31 January 2018 15:26 CET | Version of Record | https://www.mdpi.com/2077-1444/9/2/42/pdf |
