| article html file updated | 7 February 2020 21:55 CET | Update | https://www.mdpi.com/2218-2004/5/1/4 |
| article html file updated | 22 September 2019 23:54 CEST | Update | - |
| article html file updated | 4 May 2019 14:11 CEST | Update | - |
| article html file updated | 27 March 2017 09:40 CEST | Update | - |
| article html file updated | 21 January 2017 07:55 CET | Original file | - |
| article xml uploaded. | 21 January 2017 07:54 CET | Original file | https://www.mdpi.com/2218-2004/5/1/4/xml |
| article pdf uploaded. | 21 January 2017 07:54 CET | Version of Record | https://www.mdpi.com/2218-2004/5/1/4/pdf |
