| article html file updated | 7 February 2020 23:03 CET | Update | https://www.mdpi.com/2073-431X/6/1/7 |
| article html file updated | 23 September 2019 06:08 CEST | Update | - |
| article html file updated | 4 May 2019 11:55 CEST | Update | - |
| article html file updated | 29 March 2017 10:29 CEST | Update | - |
| article html file updated | 10 February 2017 10:13 CET | Original file | - |
| article xml uploaded. | 10 February 2017 10:11 CET | Original file | https://www.mdpi.com/2073-431X/6/1/7/xml |
| article pdf uploaded. | 10 February 2017 10:11 CET | Version of Record | https://www.mdpi.com/2073-431X/6/1/7/pdf |
