| article html file updated | 6 February 2020 03:29 CET | Update | https://www.mdpi.com/2079-9268/3/3/250 |
| article html file updated | 8 May 2019 02:22 CEST | Update | N/A |
| article html file updated | 21 March 2019 02:05 CET | Update | N/A |
| article html file updated | 17 June 2015 11:48 CEST | Original file | N/A |
| article pdf uploaded. | 29 July 2013 15:25 CEST | Updated version of record | https://www.mdpi.com/2079-9268/3/3/250/pdf |
