| article html file updated | 7 February 2020 19:12 CET | Update | https://www.mdpi.com/2076-3263/6/4/54 |
| article html file updated | 4 May 2019 20:07 CEST | Update | - |
| article html file updated | 7 December 2016 08:51 CET | Original file | - |
| article xml uploaded. | 7 December 2016 08:50 CET | Original file | https://www.mdpi.com/2076-3263/6/4/54/xml |
| article pdf uploaded. | 7 December 2016 08:50 CET | Version of Record | https://www.mdpi.com/2076-3263/6/4/54/pdf |
