| article html file updated | 7 February 2020 06:01 CET | Update | https://www.mdpi.com/2077-1444/7/3/31 |
| article html file updated | 21 September 2019 13:18 CEST | Update | - |
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| article html file updated | 26 March 2019 23:40 CET | Update | - |
| article html file updated | 28 March 2016 11:23 CEST | Original file | - |
| article xml uploaded. | 17 March 2016 08:54 CET | Original file | https://www.mdpi.com/2077-1444/7/3/31/xml |
| article pdf uploaded. | 17 March 2016 08:54 CET | Version of Record | https://www.mdpi.com/2077-1444/7/3/31/pdf |
