| article html file updated | 8 February 2020 20:27 CET | Update | https://www.mdpi.com/2076-3921/6/4/87 |
| article html file updated | 28 September 2019 06:32 CEST | Update | - |
| article html file updated | 2 May 2019 16:42 CEST | Update | - |
| article html file updated | 2 January 2018 20:29 CET | Update | - |
| article html file updated | 6 November 2017 14:45 CET | Original file | - |
| article xml uploaded. | 6 November 2017 14:44 CET | Update | https://www.mdpi.com/2076-3921/6/4/87/xml |
| article xml uploaded. | 6 November 2017 14:44 CET | Original file | - |
| article pdf uploaded. | 6 November 2017 14:44 CET | Version of Record | https://www.mdpi.com/2076-3921/6/4/87/pdf |
