| article html file updated | 8 February 2020 17:28 CET | Update | https://www.mdpi.com/2079-9721/5/4/21 |
| article html file updated | 27 September 2019 10:57 CEST | Update | N/A |
| article html file updated | 2 May 2019 23:27 CEST | Update | N/A |
| article html file updated | 2 January 2018 20:44 CET | Update | N/A |
| article html file updated | 29 September 2017 16:25 CEST | Original file | N/A |
| article xml uploaded. | 29 September 2017 16:24 CEST | Original file | https://www.mdpi.com/2079-9721/5/4/21/xml |
| article pdf uploaded. | 29 September 2017 16:24 CEST | Updated version of record | https://www.mdpi.com/2079-9721/5/4/21/pdf |
| article pdf uploaded. | 29 September 2017 10:41 CEST | Version of Record | N/A |
