| article html file updated | 7 February 2020 07:05 CET | Update | https://www.mdpi.com/2227-7099/4/2/6 |
| article html file updated | 5 May 2019 19:00 CEST | Update | N/A |
| article html file updated | 27 March 2019 01:32 CET | Update | N/A |
| article html file updated | 28 June 2016 09:14 CEST | Update | N/A |
| article html file updated | 11 April 2016 10:04 CEST | Original file | N/A |
| article xml uploaded. | 11 April 2016 10:03 CEST | Original file | https://www.mdpi.com/2227-7099/4/2/6/xml |
| article pdf uploaded. | 11 April 2016 10:03 CEST | Version of Record | https://www.mdpi.com/2227-7099/4/2/6/pdf |
