| article html file updated | 6 February 2020 03:55 CET | Update | https://www.mdpi.com/1999-4893/6/3/512 |
| article html file updated | 8 May 2019 01:25 CEST | Update | N/A |
| article html file updated | 21 March 2019 03:23 CET | Update | N/A |
| article html file updated | 19 December 2016 11:29 CET | Original file | N/A |
| article pdf uploaded. | 22 August 2013 09:15 CEST | Updated version of record | https://www.mdpi.com/1999-4893/6/3/512/pdf |
| article pdf uploaded. | 21 August 2013 14:01 CEST | Version of Record | https://www.mdpi.com/1999-4893/6/3/512/pdf-vor |
