| article html file updated | 7 February 2020 07:31 CET | Update | https://www.mdpi.com/2227-9059/4/2/9 |
| article html file updated | 5 May 2019 18:07 CEST | Update | N/A |
| article html file updated | 27 March 2019 02:24 CET | Update | N/A |
| article html file updated | 21 February 2017 08:42 CET | Update | N/A |
| article html file updated | 5 July 2016 12:02 CEST | Update | N/A |
| article html file updated | 20 April 2016 09:43 CEST | Original file | N/A |
| article xml uploaded. | 20 April 2016 09:42 CEST | Original file | https://www.mdpi.com/2227-9059/4/2/9/xml |
| article pdf uploaded. | 20 April 2016 09:42 CEST | Version of Record | https://www.mdpi.com/2227-9059/4/2/9/pdf |
