| article html file updated | 6 February 2020 09:31 CET | Update | https://www.mdpi.com/1999-5903/6/2/378 |
| article html file updated | 7 May 2019 14:01 CEST | Update | N/A |
| article html file updated | 21 March 2019 17:42 CET | Update | N/A |
| article html file updated | 20 August 2015 08:21 CEST | Original file | N/A |
| article pdf uploaded. | 27 May 2014 08:41 CEST | Version of Record | https://www.mdpi.com/1999-5903/6/2/378/pdf |
