| article html file updated | 6 February 2020 01:22 CET | Update | https://www.mdpi.com/1996-1073/6/4/1961 |
| article html file updated | 8 May 2019 06:35 CEST | Update | - |
| article html file updated | 20 March 2019 20:39 CET | Update | - |
| article html file updated | 20 July 2017 11:30 CEST | Update | - |
| article html file updated | 20 July 2017 11:29 CEST | Update | - |
| article html file updated | 20 July 2017 11:27 CEST | Original file | - |
| article xml uploaded. | 20 July 2017 11:26 CEST | Update | https://www.mdpi.com/1996-1073/6/4/1961/xml |
| article pdf uploaded. | 3 April 2013 15:42 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/4/1961/pdf |
