| article html file updated | 6 February 2020 10:03 CET | Update | https://www.mdpi.com/1999-5903/6/2/397 |
| article html file updated | 20 September 2019 09:26 CEST | Update | - |
| article html file updated | 7 May 2019 12:54 CEST | Update | - |
| article html file updated | 21 March 2019 19:08 CET | Update | - |
| article html file updated | 20 August 2015 10:17 CEST | Original file | - |
| article pdf uploaded. | 18 June 2014 14:24 CEST | Version of Record | https://www.mdpi.com/1999-5903/6/2/397/pdf |
