| article html file updated | 7 February 2020 20:15 CET | Update | https://www.mdpi.com/1999-4907/8/1/9 |
| article html file updated | 22 September 2019 14:54 CEST | Update | N/A |
| article html file updated | 4 May 2019 17:55 CEST | Update | N/A |
| article html file updated | 8 February 2017 10:14 CET | Update | N/A |
| article html file updated | 24 December 2016 06:47 CET | Original file | N/A |
| article xml uploaded. | 24 December 2016 06:46 CET | Original file | https://www.mdpi.com/1999-4907/8/1/9/xml |
| article pdf uploaded. | 24 December 2016 06:46 CET | Version of Record | https://www.mdpi.com/1999-4907/8/1/9/pdf |
