| article html file updated | 9 February 2020 17:26 CET | Update | https://www.mdpi.com/2305-7084/2/2/21 |
| article html file updated | 3 October 2019 13:12 CEST | Update | N/A |
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| article html file updated | 14 May 2018 05:33 CEST | Update | N/A |
| article xml uploaded. | 14 May 2018 05:31 CEST | Update | https://www.mdpi.com/2305-7084/2/2/21/xml |
| article html file updated | 14 May 2018 05:22 CEST | Update | N/A |
| article pdf uploaded. | 14 May 2018 05:21 CEST | Updated version of record | https://www.mdpi.com/2305-7084/2/2/21/pdf |
| article xml file uploaded | 14 May 2018 05:21 CEST | Update | N/A |
| article html file updated | 14 May 2018 03:23 CEST | Original file | N/A |
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