| article html file updated | 6 February 2020 11:27 CET | Update | https://www.mdpi.com/1999-5903/6/3/457 |
| article html file updated | 7 May 2019 09:46 CEST | Update | - |
| article html file updated | 21 March 2019 23:02 CET | Original file | - |
| article pdf uploaded. | 14 August 2014 13:44 CEST | Updated version of record | https://www.mdpi.com/1999-5903/6/3/457/pdf |
| article pdf uploaded. | 13 August 2014 16:15 CEST | Version of Record | https://www.mdpi.com/1999-5903/6/3/457/pdf-vor |
