| article html file updated | 7 February 2020 23:48 CET | Update | https://www.mdpi.com/2226-4310/4/1/9 |
| article html file updated | 23 September 2019 10:12 CEST | Update | - |
| article html file updated | 4 May 2019 10:27 CEST | Update | - |
| article html file updated | 29 March 2017 05:57 CEST | Update | - |
| article html file updated | 20 February 2017 11:59 CET | Original file | - |
| article xml uploaded. | 20 February 2017 11:58 CET | Update | https://www.mdpi.com/2226-4310/4/1/9/xml |
| article xml uploaded. | 20 February 2017 11:58 CET | Original file | - |
| article pdf uploaded. | 20 February 2017 11:58 CET | Version of Record | https://www.mdpi.com/2226-4310/4/1/9/pdf |
