| article html file updated | 6 February 2020 00:25 CET | Update | https://www.mdpi.com/2078-1547/4/1/17 |
| article html file updated | 19 September 2019 17:43 CEST | Update | N/A |
| article html file updated | 8 May 2019 08:45 CEST | Update | N/A |
| article html file updated | 20 March 2019 18:17 CET | Update | N/A |
| article html file updated | 29 June 2017 13:17 CEST | Update | N/A |
| article html file updated | 17 June 2015 06:16 CEST | Update | N/A |
| article html file updated | 8 February 2013 09:52 CET | Original file | N/A |
| article pdf uploaded. | 5 February 2013 16:29 CET | Version of Record | https://www.mdpi.com/2078-1547/4/1/17/pdf |
