| article html file updated | 7 February 2020 15:45 CET | Update | https://www.mdpi.com/2075-4450/7/4/51 |
| article html file updated | 22 September 2019 01:57 CEST | Update | - |
| article html file updated | 5 May 2019 02:44 CEST | Update | - |
| article html file updated | 29 December 2016 04:29 CET | Update | - |
| article html file updated | 29 September 2016 07:12 CEST | Original file | - |
| article xml uploaded. | 29 September 2016 07:11 CEST | Original file | https://www.mdpi.com/2075-4450/7/4/51/xml |
| article pdf uploaded. | 29 September 2016 07:11 CEST | Version of Record | https://www.mdpi.com/2075-4450/7/4/51/pdf |
