| article html file updated | 7 February 2020 04:31 CET | Update | https://www.mdpi.com/1996-1073/9/2/104 |
| article html file updated | 6 May 2019 00:28 CEST | Update | - |
| article html file updated | 26 March 2019 20:37 CET | Original file | - |
| article pdf uploaded. | 16 February 2016 04:52 CET | Updated version of record | https://www.mdpi.com/1996-1073/9/2/104/pdf |
| article xml uploaded. | 16 February 2016 04:52 CET | Original file | https://www.mdpi.com/1996-1073/9/2/104/xml |
| article pdf uploaded. | 12 February 2016 08:22 CET | Version of Record | https://www.mdpi.com/1996-1073/9/2/104/pdf-vor |
