| article html file updated | 6 February 2020 02:47 CET | Update | https://www.mdpi.com/2079-9268/3/3/215 |
| article html file updated | 8 May 2019 03:44 CEST | Update | N/A |
| article html file updated | 21 March 2019 00:11 CET | Update | N/A |
| article html file updated | 17 June 2015 10:28 CEST | Original file | N/A |
| article pdf uploaded. | 25 June 2013 14:33 CEST | Updated version of record | https://www.mdpi.com/2079-9268/3/3/215/pdf |
| article pdf uploaded. | 24 June 2013 14:18 CEST | Version of Record | https://www.mdpi.com/2079-9268/3/3/215/pdf-vor |
