| article html file updated | 11 February 2020 03:01 CET | Update | https://www.mdpi.com/2077-1312/6/4/156 |
| article html file updated | 11 October 2019 22:07 CEST | Update | - |
| article html file updated | 27 April 2019 19:47 CEST | Update | - |
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| article html file updated | 26 December 2018 12:13 CET | Update | - |
| article html file updated | 13 December 2018 12:16 CET | Original file | - |
| article pdf uploaded. | 13 December 2018 12:14 CET | Version of Record | https://www.mdpi.com/2077-1312/6/4/156/pdf |
| article xml uploaded. | 13 December 2018 12:14 CET | Update | https://www.mdpi.com/2077-1312/6/4/156/xml |
| article xml file uploaded | 13 December 2018 12:14 CET | Original file | - |
