| article html file updated | 7 February 2020 22:00 CET | Update | https://www.mdpi.com/2227-7099/5/1/4 |
| article html file updated | 23 September 2019 00:20 CEST | Update | - |
| article html file updated | 4 May 2019 14:01 CEST | Update | - |
| article html file updated | 30 March 2017 03:37 CEST | Update | - |
| article html file updated | 23 January 2017 06:05 CET | Original file | - |
| article xml uploaded. | 23 January 2017 06:04 CET | Original file | https://www.mdpi.com/2227-7099/5/1/4/xml |
| article pdf uploaded. | 23 January 2017 06:04 CET | Version of Record | https://www.mdpi.com/2227-7099/5/1/4/pdf |
