| article html file updated | 7 February 2020 15:40 CET | Update | https://www.mdpi.com/2073-431X/5/4/21 |
| article html file updated | 5 May 2019 02:53 CEST | Update | - |
| article html file updated | 28 December 2016 08:25 CET | Update | - |
| article html file updated | 28 September 2016 23:05 CEST | Original file | - |
| article xml uploaded. | 28 September 2016 08:48 CEST | Original file | https://www.mdpi.com/2073-431X/5/4/21/xml |
| article pdf uploaded. | 28 September 2016 08:48 CEST | Version of Record | https://www.mdpi.com/2073-431X/5/4/21/pdf |
