| article html file updated | 7 February 2020 04:45 CET | Update | https://www.mdpi.com/1996-1073/9/2/117 |
| article html file updated | 5 May 2019 23:55 CEST | Update | N/A |
| article html file updated | 26 March 2019 21:06 CET | Original file | N/A |
| article pdf uploaded. | 19 February 2016 11:22 CET | Version of Record | https://www.mdpi.com/1996-1073/9/2/117/pdf |
| article xml uploaded. | 19 February 2016 11:22 CET | Original file | https://www.mdpi.com/1996-1073/9/2/117/xml |
