| article html file updated | 7 February 2020 04:42 CET | Update | https://www.mdpi.com/2227-7390/4/1/7 |
| article html file updated | 21 September 2019 11:31 CEST | Update | - |
| article html file updated | 6 May 2019 00:01 CEST | Update | - |
| article html file updated | 26 March 2019 21:01 CET | Update | - |
| article html file updated | 29 March 2016 07:20 CEST | Original file | - |
| article pdf uploaded. | 18 February 2016 10:25 CET | Version of Record | https://www.mdpi.com/2227-7390/4/1/7/pdf |
| article xml uploaded. | 18 February 2016 10:25 CET | Original file | https://www.mdpi.com/2227-7390/4/1/7/xml |
