| article html file updated | 7 February 2020 18:41 CET | Update | https://www.mdpi.com/2079-6374/6/4/57 |
| article html file updated | 22 September 2019 07:17 CEST | Update | - |
| article html file updated | 4 May 2019 21:11 CEST | Update | - |
| article html file updated | 28 December 2016 10:56 CET | Update | - |
| article html file updated | 28 November 2016 03:44 CET | Original file | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | https://www.mdpi.com/2079-6374/6/4/57/xml |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:43 CET | Update | - |
| article xml uploaded. | 28 November 2016 03:42 CET | Original file | - |
| article pdf uploaded. | 28 November 2016 03:42 CET | Version of Record | https://www.mdpi.com/2079-6374/6/4/57/pdf |
