| article html file updated | 6 February 2020 09:14 CET | Update | https://www.mdpi.com/1999-5903/6/2/337 |
| article html file updated | 7 May 2019 14:35 CEST | Update | N/A |
| article html file updated | 21 March 2019 17:00 CET | Update | N/A |
| article html file updated | 20 August 2015 06:47 CEST | Original file | N/A |
| article pdf uploaded. | 15 May 2014 11:14 CEST | Updated version of record | https://www.mdpi.com/1999-5903/6/2/337/pdf |
| article pdf uploaded. | 14 May 2014 09:59 CEST | Version of Record | https://www.mdpi.com/1999-5903/6/2/337/pdf-vor |
