| article html file updated | 6 February 2020 13:40 CET | Update | https://www.mdpi.com/1999-5903/6/4/717 |
| article html file updated | 7 May 2019 05:28 CEST | Update | N/A |
| article html file updated | 25 March 2019 17:46 CET | Update | N/A |
| article html file updated | 21 August 2015 02:05 CEST | Update | N/A |
| article html file updated | 18 November 2014 08:31 CET | Original file | N/A |
| article xml file uploaded | 18 November 2014 08:31 CET | Original file | https://www.mdpi.com/1999-5903/6/4/717/xml |
| article pdf uploaded. | 14 November 2014 16:40 CET | Version of Record | https://www.mdpi.com/1999-5903/6/4/717/pdf |
