| article html file updated | 6 February 2020 12:03 CET | Update | https://www.mdpi.com/1999-5903/6/3/556 |
| article html file updated | 7 May 2019 08:38 CEST | Update | N/A |
| article html file updated | 22 March 2019 00:27 CET | Update | N/A |
| article html file updated | 20 August 2015 17:46 CEST | Original file | N/A |
| article pdf uploaded. | 9 September 2014 11:07 CEST | Updated version of record | https://www.mdpi.com/1999-5903/6/3/556/pdf |
| article pdf uploaded. | 8 September 2014 08:06 CEST | Version of Record | https://www.mdpi.com/1999-5903/6/3/556/pdf-vor |
