| article html file updated | 6 February 2020 02:51 CET | Update | https://www.mdpi.com/1996-1073/6/7/3134 |
| article html file updated | 8 May 2019 03:34 CEST | Update | N/A |
| article html file updated | 21 March 2019 00:23 CET | Update | N/A |
| article html file updated | 19 April 2017 11:30 CEST | Original file | N/A |
| article pdf uploaded. | 27 June 2013 09:46 CEST | Version of Record | https://www.mdpi.com/1996-1073/6/7/3134/pdf |
