| article html file updated | 7 February 2020 02:29 CET | Update | https://www.mdpi.com/1999-5903/7/4/500 |
| article html file updated | 6 May 2019 04:28 CEST | Update | N/A |
| article html file updated | 26 March 2019 16:53 CET | Original file | N/A |
| article pdf uploaded. | 21 December 2015 14:36 CET | Version of Record | https://www.mdpi.com/1999-5903/7/4/500/pdf |
| article xml uploaded. | 21 December 2015 14:36 CET | Original file | https://www.mdpi.com/1999-5903/7/4/500/xml |
