| article html file updated | 7 February 2020 07:19 CET | Update | https://www.mdpi.com/2227-7099/4/2/7 |
| article html file updated | 5 May 2019 18:31 CEST | Update | - |
| article html file updated | 27 March 2019 02:00 CET | Update | - |
| article html file updated | 28 June 2016 09:14 CEST | Update | - |
| article html file updated | 15 April 2016 11:19 CEST | Original file | - |
| article xml uploaded. | 15 April 2016 11:18 CEST | Original file | https://www.mdpi.com/2227-7099/4/2/7/xml |
| article pdf uploaded. | 15 April 2016 11:18 CEST | Version of Record | https://www.mdpi.com/2227-7099/4/2/7/pdf |
