| article html file updated | 7 February 2020 19:21 CET | Update | https://www.mdpi.com/2076-3263/6/4/56 |
| article html file updated | 22 September 2019 10:01 CEST | Update | - |
| article html file updated | 4 May 2019 19:48 CEST | Update | - |
| article html file updated | 12 December 2016 08:25 CET | Original file | - |
| article xml uploaded. | 12 December 2016 08:24 CET | Original file | https://www.mdpi.com/2076-3263/6/4/56/xml |
| article pdf uploaded. | 12 December 2016 08:24 CET | Version of Record | https://www.mdpi.com/2076-3263/6/4/56/pdf |
