| article html file updated | 7 February 2020 20:05 CET | Update | https://www.mdpi.com/1999-4907/8/1/2 |
| article html file updated | 22 September 2019 14:00 CEST | Update | N/A |
| article html file updated | 4 May 2019 18:16 CEST | Update | N/A |
| article html file updated | 8 February 2017 10:10 CET | Update | N/A |
| article html file updated | 22 December 2016 07:16 CET | Original file | N/A |
| article xml uploaded. | 22 December 2016 07:15 CET | Update | https://www.mdpi.com/1999-4907/8/1/2/xml |
| article xml uploaded. | 22 December 2016 07:15 CET | Original file | N/A |
| article pdf uploaded. | 22 December 2016 07:15 CET | Version of Record | https://www.mdpi.com/1999-4907/8/1/2/pdf |
