| article html file updated | 7 February 2020 02:26 CET | Update | https://www.mdpi.com/1999-5903/7/4/484 |
| article html file updated | 6 May 2019 04:34 CEST | Update | - |
| article html file updated | 26 March 2019 16:49 CET | Original file | - |
| article pdf uploaded. | 18 December 2015 14:19 CET | Version of Record | https://www.mdpi.com/1999-5903/7/4/484/pdf |
| article xml uploaded. | 18 December 2015 14:19 CET | Original file | https://www.mdpi.com/1999-5903/7/4/484/xml |
