| article html file updated | 7 February 2020 20:52 CET | Update | https://www.mdpi.com/1999-4907/8/1/20 |
| article html file updated | 22 September 2019 18:22 CEST | Update | N/A |
| article html file updated | 4 May 2019 16:36 CEST | Update | N/A |
| article html file updated | 8 February 2017 10:17 CET | Update | N/A |
| article html file updated | 6 January 2017 08:42 CET | Original file | N/A |
| article xml uploaded. | 6 January 2017 08:41 CET | Original file | https://www.mdpi.com/1999-4907/8/1/20/xml |
| article pdf uploaded. | 6 January 2017 08:41 CET | Version of Record | https://www.mdpi.com/1999-4907/8/1/20/pdf |
