| article html file updated | 6 February 2020 05:28 CET | Update | https://www.mdpi.com/1999-4893/6/4/762 |
| article html file updated | 7 May 2019 22:16 CEST | Update | N/A |
| article html file updated | 21 March 2019 07:28 CET | Update | N/A |
| article html file updated | 17 December 2016 07:50 CET | Original file | N/A |
| article pdf uploaded. | 13 November 2013 16:44 CET | Updated version of record | https://www.mdpi.com/1999-4893/6/4/762/pdf |
| article pdf uploaded. | 12 November 2013 09:54 CET | Version of Record | https://www.mdpi.com/1999-4893/6/4/762/pdf-vor |
