| article html file updated | 9 February 2020 07:41 CET | Update | https://www.mdpi.com/2304-6740/6/1/31 |
| article html file updated | 1 October 2019 01:22 CEST | Update | - |
| article html file updated | 1 May 2019 16:12 CEST | Update | - |
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| article html file updated | 27 March 2018 12:36 CEST | Update | - |
| article html file updated | 26 February 2018 15:39 CET | Original file | - |
| article xml uploaded. | 26 February 2018 15:38 CET | Original file | https://www.mdpi.com/2304-6740/6/1/31/xml |
| article pdf uploaded. | 26 February 2018 15:38 CET | Version of Record | https://www.mdpi.com/2304-6740/6/1/31/pdf |
