| article html file updated | 6 February 2020 03:44 CET | Update | https://www.mdpi.com/1996-1073/6/8/4134 |
| article html file updated | 8 May 2019 01:50 CEST | Update | N/A |
| article html file updated | 21 March 2019 02:50 CET | Update | N/A |
| article html file updated | 30 March 2017 11:55 CEST | Original file | N/A |
| article pdf uploaded. | 12 August 2013 15:55 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/8/4134/pdf |
