| article html file updated | 9 February 2020 12:10 CET | Update | https://www.mdpi.com/2409-9287/3/2/9 |
| article html file updated | 1 May 2019 06:48 CEST | Update | N/A |
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| article html file updated | 29 March 2019 11:55 CET | Update | N/A |
| article html file updated | 3 April 2018 12:43 CEST | Update | N/A |
| article html file updated | 2 April 2018 23:32 CEST | Original file | N/A |
| article xml uploaded. | 2 April 2018 06:23 CEST | Original file | https://www.mdpi.com/2409-9287/3/2/9/xml |
| article pdf uploaded. | 2 April 2018 06:23 CEST | Version of Record | https://www.mdpi.com/2409-9287/3/2/9/pdf |
