| article html file updated | 7 February 2020 03:27 CET | Update | https://www.mdpi.com/1996-1073/9/1/48 |
| article html file updated | 6 May 2019 02:33 CEST | Update | - |
| article html file updated | 26 March 2019 18:28 CET | Original file | - |
| article pdf uploaded. | 15 January 2016 08:45 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/48/pdf |
| article xml uploaded. | 15 January 2016 08:45 CET | Original file | https://www.mdpi.com/1996-1073/9/1/48/xml |
