| article html file updated | 7 February 2020 03:47 CET | Update | https://www.mdpi.com/1999-5903/8/1/3 |
| article html file updated | 6 May 2019 01:54 CEST | Update | - |
| article html file updated | 26 March 2019 19:10 CET | Original file | - |
| article pdf uploaded. | 22 January 2016 13:34 CET | Version of Record | https://www.mdpi.com/1999-5903/8/1/3/pdf |
| article xml uploaded. | 22 January 2016 13:34 CET | Original file | https://www.mdpi.com/1999-5903/8/1/3/xml |
