| article html file updated | 9 February 2020 00:08 CET | Update | https://www.mdpi.com/2218-6581/6/4/40 |
| article html file updated | 29 September 2019 05:35 CEST | Update | - |
| article html file updated | 2 May 2019 08:26 CEST | Update | - |
| article html file updated | 18 April 2019 06:13 CEST | Update | - |
| article html file updated | 2 January 2018 10:47 CET | Update | - |
| article html file updated | 14 December 2017 15:55 CET | Original file | - |
| article xml uploaded. | 14 December 2017 15:54 CET | Update | https://www.mdpi.com/2218-6581/6/4/40/xml |
| article xml uploaded. | 14 December 2017 15:54 CET | Update | - |
| article xml uploaded. | 14 December 2017 15:54 CET | Original file | - |
| article pdf uploaded. | 14 December 2017 15:54 CET | Version of Record | https://www.mdpi.com/2218-6581/6/4/40/pdf |
