| article html file updated | 6 February 2020 04:19 CET | Update | https://www.mdpi.com/2227-9040/1/2/3 |
| article html file updated | 8 May 2019 00:35 CEST | Update | N/A |
| article html file updated | 21 March 2019 04:25 CET | Update | N/A |
| article html file updated | 17 June 2015 13:07 CEST | Update | N/A |
| article html file updated | 29 October 2013 17:59 CET | Original file | N/A |
| article xml uploaded. | 29 October 2013 17:59 CET | Original file | https://www.mdpi.com/2227-9040/1/2/3/xml |
| article pdf uploaded. | 11 September 2013 14:54 CEST | Version of Record | https://www.mdpi.com/2227-9040/1/2/3/pdf |
