| article html file updated | 8 February 2020 07:42 CET | Update | https://www.mdpi.com/1999-4923/9/2/21 |
| article html file updated | 25 September 2019 05:27 CEST | Update | N/A |
| article html file updated | 3 May 2019 18:33 CEST | Update | N/A |
| article html file updated | 29 June 2017 12:45 CEST | Update | N/A |
| article html file updated | 7 June 2017 13:17 CEST | Original file | N/A |
| article xml uploaded. | 7 June 2017 13:16 CEST | Original file | https://www.mdpi.com/1999-4923/9/2/21/xml |
| article pdf uploaded. | 7 June 2017 13:16 CEST | Version of Record | https://www.mdpi.com/1999-4923/9/2/21/pdf |
