| article html file updated | 7 February 2020 03:23 CET | Update | https://www.mdpi.com/1996-1073/9/1/44 |
| article html file updated | 6 May 2019 02:41 CEST | Update | - |
| article html file updated | 26 March 2019 18:21 CET | Original file | - |
| article pdf uploaded. | 14 January 2016 08:31 CET | Version of Record | https://www.mdpi.com/1996-1073/9/1/44/pdf |
| article xml uploaded. | 14 January 2016 08:31 CET | Original file | https://www.mdpi.com/1996-1073/9/1/44/xml |
